Note 1 – Description of Business

National HealthCare Corporation (“NHC” or the “Company”) is a leading provider of senior health care services. As of June 30, 2018, we operate or manage, through certain affiliates, 76 skilled nursing facilities with a total of 9,629 licensed beds, 24 assisted living facilities, five independent living facilities, and 36 homecare programs. We operate specialized care units within certain of our healthcare centers such as Alzheimer's disease care units and sub-acute nursing units. We also have a noncontrolling ownership interest in a hospice care business that services NHC owned skilled nursing facilities and others. In addition, we provide insurance services, management and accounting services, and we lease properties to operators of skilled nursing facilities. We operate in 10 states and are located primarily in the southeastern United States.

Note 2 – Summary of Significant Accounting Policies

The listing below is not intended to be a comprehensive list of all our significant accounting policies. In many cases, the accounting treatment of a particular transaction is specifically dictated by generally accepted accounting principles, with limited need for management’s judgment in their application. There are also areas in which management’s judgment in selecting any available alternative would not produce a materially different result. See our audited December 31, 2017 consolidated financial statements and notes thereto which contain accounting policies and other disclosures required by generally accepted accounting principles. Our audited December 31, 2017 consolidated financial statements are available at our web site: www.nhccare.com.

Basis of Presentation

The unaudited interim condensed consolidated financial statements to which these notes are attached include all normal, recurring adjustments which are necessary to fairly present the financial position, results of operations and cash flows of NHC. All significant intercompany transactions and balances have been eliminated in consolidation. The consolidated financial statements include the accounts of all entities controlled by NHC. The Company presents noncontrolling interest within the equity section of its consolidated balance sheets. The Company presents the amount of consolidated net income (loss) that is attributable to NHC and the noncontrolling interest in its consolidated statements of operations.

We assume that users of these interim condensed consolidated financial statements have read or have access to the audited December 31, 2017 consolidated financial statements and Management’s Discussion and Analysis of Financial Condition and Results of Operations and that the adequacy of additional disclosure needed for a fair presentation, except in regard to material contingencies, may be determined in that context. Accordingly, footnotes and other disclosures which would substantially duplicate the disclosure contained in our most recent annual report to stockholders have been omitted. This interim financial information is not necessarily indicative of the results that may be expected for a full year for a variety of reasons.

Estimates and Assumptions

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and could cause our reported net income to vary significantly from period to period.

Recently Adopted Accounting Guidance

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2014–09 “Revenue from Contracts with Customers,” also known as the “New Revenue Standard.” This update is the result of a collaborative effort by the FASB and the International Accounting Standards Board to simplify revenue recognition guidance, remove inconsistencies in the application of revenue recognition, and to improve comparability of revenue recognition practices across entities, industries, jurisdictions, and capital markets. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to receive for those goods or services. The New Revenue Standard is applied through the following five-step process:

1. Identify the contract(s) with a customer.

2. Identify the performance obligation in the contract.

3. Determine the transaction price.

4. Allocate the transaction price to the performance obligations in the contract.

5. Recognize revenue when (or as) the entity satisfies a performance obligation.

For a public entity, this update is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period by applying either the full retrospective method or the cumulative catch-up transition method.

On January 1, 2018, the Company adopted the provisions of ASU No. 2014-09 using the full retrospective method, which requires us to restate each prior reporting period presented. The most significant impact to NHC relates to the recording of revenue for patients that have individual copayment responsibilities and are eligible for both Medicare and Medicaid benefits (also known as dual eligible patients). As such with these patients, net patient revenues will only include the amounts expected to be collected from the patients in accordance with ASU No. 2014-09. Under the prior accounting guidance, we recorded the price stated in the contract as net patient revenue, and the amounts not collected from our patients were recorded as bad debts in other operating expenses. The adoption of ASU No. 2014-09 has no impact on the Company’s accounts receivable as it was historically recorded net of allowance for doubtful accounts and contractual adjustments. The following tables present the effect on the interim condensed consolidated statements of operations for the three months and six months ended June 30, 2017 for the accounting change that was retrospectively adopted on January 1, 2018:

Consolidated Statements of Operations

(in thousands)

In January 2016, the FASB issued ASU No. 2016–01, “Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities (Topic 825).” ASU No. 2016–01 revises the classification and measurement of investments in certain equity investments and the presentation of certain fair value changes for certain financial liabilities measured at fair value. ASU No. 2016–01 requires the change in fair value of many equity investments to be recognized in net income.  On January 1, 2018, the Company adopted the provisions of ASU No. 2016-01 using the modified retrospective method as required by the standard. The adoption of ASU No. 2016-01 resulted in a $68,073,000 reclassification of net unrealized gains from accumulated other comprehensive income (“AOCI”) to the opening balance of retained earnings. For the three months and six months ended June 30, 2018, the Company recognized a gain of $12,448,000 and a loss of $3,069,000, respectively, in our interim condensed consolidated statement of operations related to the change in fair value of our marketable equity securities.  The adoption of ASU No. 2016-01 increases the volatility of other income due to the market fluctuation of our marketable equity securities.

In August 2016, the FASB issued ASU No. 2016-15, “Clarification on Classification of Certain Cash Receipts and Cash Payments on the Statements of Cash Flows.” ASU No. 2016-15 was issued to create consistency in the classification of eight specific cash flow items and provides an accounting policy election for classifying distributions received from equity method investments. Such equity method investment distributions are now classified using a 1) cumulative earnings approach, or 2) nature of distribution approach. On January 1, 2018, the Company adopted the provisions of ASU No. 2016-15 and this standard did not have a material impact on our consolidated financial statements.

In May 2017, the FASB issued ASU No. 2017-09, “Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting.” ASU No. 2017-09 amends the scope of modification accounting for share-based payment arrangements. The ASU provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under Accounting Standards Codification ("ASC") 718. On January 1, 2018, the Company adopted the provisions of ASU No. 2017-09 and this standard did not have a material impact on our consolidated financial statements.

In February 2018, the FASB issued ASU No. 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” ASU No. 2018-02 permits a company to reclassify disproportionate tax effects in accumulated other comprehensive income caused by the Tax Cuts and Jobs Act of 2017 to retained earnings. The FASB refers to these amounts as “stranded tax effects.” On January 1, 2018, the Company early adopted the provisions of ASU No. 2018-02. The adoption of this standard resulted in an adjustment of accumulated other comprehensive income, with a corresponding adjustment to the opening balance of retained earnings in the amount of $128,000, related to the stranded tax effects of the unrealized losses in our restricted marketable debt securities.

Recent Accounting Guidance Not Yet Adopted      

In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)." The objective of this update is to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. This ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those annual periods and is to be applied utilizing a modified retrospective approach. We anticipate this standard will have a material impact on our consolidated financial statements and will result in an increase to total assets and total liabilities. Additionally, we are currently evaluating the impact this standard will have on our policies and procedures and internal control framework.

In June 2016, the FASB issued ASU No. 2016-13, "Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments."  ASU No. 2016-13 replaces the current incurred loss impairment methodology for credit losses with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates.  This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within those annual periods, with early adoption permitted for fiscal years beginning after December 15, 2018.  We are currently evaluation the impact this standard will have on our policies and procedures and internal control framework.

Segment Reporting

In accordance with the provisions of ASC 280, “Segment Reporting”, the Company is required to report financial and descriptive information about its reportable operating segments. The Company has two reportable operating segments: (1) inpatient services, which includes the operation of skilled nursing facilities and assisted and independent living facilities, and (2) homecare services. The Company also reports an “all other” category that includes revenues from rental income, management and accounting services fees, insurance services, and costs of the corporate office. See Note 6 for further disclosure of the Company’s operating segments.

Other Operating Expenses

Other operating expenses include the costs of care and services that we provide to the residents of our facilities and the costs of maintaining our facilities. Our primary patient care costs include drugs, medical supplies, purchased professional services, food, and professional liability insurance and licensing fees. The primary facility costs include utilities and property insurance.

General and Administrative Costs

With the Company being a healthcare provider, the majority of our expenses are "cost of revenue" items. Costs that could be classified as "general and administrative" by the Company would include its corporate office costs, excluding stock-based compensation, which were $6,573,000 and $13,250,000 for the three months and six months ended June 30, 2018, respectively. General and administrative costs were $6,390,000 and $15,262,000 for the three months and six months ended June 30, 2017, respectively.

Property and Equipment

Property and equipment are recorded at cost. Depreciation is provided by the straight-line method over the expected useful lives of the assets estimated as follows: buildings and improvements, 20-40 years and equipment and furniture, 3-15 years. Leasehold improvements are amortized over periods that do not exceed the non-cancelable respective lease terms using the straight-line method.

Capital leases are recorded at the lower of fair market value or the present value of future minimum lease payments. Capital leases are amortized in accordance with the provision codified within Accounting Standards Codification (“ASC”) Subtopic 840-30, Leases – Capital Leases. Amortization of capital lease assets is included in depreciation and amortization expense.

Accrued Risk Reserves  

We are self–insured for risks related to health insurance and have wholly–owned limited purpose insurance companies that insure risks related to workers’ compensation and general and professional liability insurance claims. The accrued risk reserves include a liability for reported claims and estimates for incurred but unreported claims. Our policy is to engage an external, independent actuary to assist in estimating our exposure for claims obligations (for both asserted and unasserted claims). We reassess our accrued risk reserves on a quarterly basis.

Professional liability remains an area of particular concern to us. The long-term care industry has seen an increase in personal injury/wrongful death claims based on alleged negligence by skilled nursing facilities and their employees in providing care to residents. As of June 30, 2018, we and/or our managed centers are defendants in 63 such claims. It remains possible that those pending matters plus potential unasserted claims could exceed our reserves, which could have a material adverse effect on our consolidated financial position, results of operations and cash flows. It is also possible that future events could cause us to make significant adjustments or revisions to these reserve estimates and cause our reported net income to vary significantly from period to period.

We are principally self-insured for incidents occurring in all centers owned or leased by us. The coverages include both primary policies and excess policies. In all years, settlements, if any, in excess of available insurance policy limits and our own reserves would be expensed by us.

Continuing Care Contracts and Refundable Entrance Fee

We have one CCRC within our operations. Residents at this retirement center may enter into continuing care contracts with us. The contracts provide that 10% of the resident entry fee becomes non-refundable upon occupancy, and the remaining refundable portion of the entry fee is calculated using the lessor of the price at which the apartment is re-assigned or 90% of the original entry fee, plus 40% of any appreciation if the apartment exceeds the original resident’s entry fee.

Non-refundable fees are included as a component of the transaction price and are amortized into revenue over the actuarially determined remaining life of the resident, which is the expected period of occupancy by the resident. We pay the refundable portion of our entry fees to residents when they relocate from our community and the apartment is re-occupied. Refundable entrance fees are not included as part of the transaction price and are classified as non-current liabilities in the Company's consolidated balance sheets. The balances of refundable entrance fees as of June 30, 2018 and December 31, 2017 were $8,668,000 and $8,827,000, respectively.

Obligation to Provide Future Services

We annually estimate the present value of the cost of future services and the use of facilities to be provided to the current CCRC residents and compare that amount with the balance of non-refundable deferred revenue from entrance fees received. If the present value of the cost of future services exceeds the related anticipated revenues, a liability is recorded (obligation to provide future services) with a corresponding charge to income. As of June 30, 2018, and December 31, 2017, we have recorded a future service obligation in the amount of $2,887,000.

Other Noncurrent Liabilities

Other noncurrent liabilities include reserves primarily related to various uncertain income tax positions.

Deferred Revenue

Deferred revenue includes the deferred gain on the sale of assets to National Health Corporation (“National”), the non-refundable portion (10%) of CCRC entrance fees being amortized over the remaining life expectancies of the residents, and premiums received within our workers’ compensation and professional liability companies that are not yet earned.

Noncontrolling Interest

The noncontrolling interest in a subsidiary is presented within total equity in the Company's interim condensed consolidated balance sheets. The Company presents the noncontrolling interest and the amount of consolidated net income attributable to NHC in its interim condensed consolidated statements of operations. The Company’s earnings per share is calculated based on net income attributable to NHC’s stockholders. The carrying amount of the noncontrolling interest is adjusted based on an allocation of subsidiary earnings based on ownership interest.

Variable Interest Entities

We have equity interests in unconsolidated limited liability companies that operate various post-acute and senior healthcare businesses. We analyze our investments in these limited liability companies to determine if the company is considered a VIE and would require consolidation. To the extent that we own interests in a VIE and we (i) are the sole entity that has the power to direct the activities of the VIE and (ii) have the obligation or rights to absorb the VIE's losses or receive its benefits, then we would be determined to be the primary beneficiary and would consolidate the VIE. To the extent we own interests in a VIE, then at each reporting period, we re-assess our conclusions as to which, if any, party within the VIE is considered the primary beneficiary.

The Company's maximum exposure to losses in its investments in unconsolidated VIEs cannot be quantified and may or may not be limited to its investment in the unconsolidated VIE. The investments in unconsolidated VIEs are classified as “investments in limited liability companies” in the consolidated balance sheets.

Prior Period Classifications

Certain amounts in prior periods have been reclassified to conform with current period presentation.

Note 3 – Net Patient Revenues

Net patient revenues are derived from services rendered to patients for skilled and intermediate nursing, rehabilitation therapy, assisted living and independent living, and home health care services. Net patient revenue is reported at the amount that reflects the consideration to which the Company expects to be entitled in exchange for providing patient services. These amounts are due from patients, governmental programs, and other third-party payors, and include variable consideration for retroactive revenue adjustments due to settlement of audits, reviews, and investigations.

The Company disaggregates revenue from contracts with customers by service type and by payor.

Revenue by Service Type

The Company’s net patient services can generally be classified into the following two categories: (1) inpatient services, which includes the operation of skilled nursing facilities and assisted and independent living facilities, and (2) homecare services.

The Company recognizes revenue as its performance obligations are completed. The performance obligations are satisfied over time as the patient simultaneously receives and consumes the benefits of the healthcare services provided. For inpatient services, revenue is recognized on a daily basis as each day represents a separate contract and performance obligation. For homecare, revenue is recognized when services are provided based on the number of days of service rendered in the episode or on a per-visit basis. Typically, patients and third-party payors are billed monthly after services are performed or the patient is discharged and payments are due based on contract terms.

As our performance obligations relate to contracts with a duration of one year or less, the Company has elected to apply the optional exemption provided in FASB ASC 606-10-50-14(a) and, therefore, is not required to disclose the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period. The Company has minimal unsatisfied performance obligations at the end of the reporting period as our patients are typically under no obligation to remain admitted in our facilities or under our care.

As the period between the time of service and time of payment is typically one year or less, the Company elected as a practical expedient under ASC 606-10-32-18 to not adjust for the effects of a significant financing component.

Revenue by Payor

Certain groups of patients receive funds to pay the cost of their care from a common source. The following table sets forth sources of net patient revenues for the periods indicated:

The Company determines the transaction price based on established billing rates reduced by contractual adjustments provided to third party payors.  Contractual adjustments are based on contractual agreements and historical experience.  The Company considers the patient's ability and intent to pay the amount of consideration upon admission.  Subsequent changes resulting from a patient’s ability to pay are recorded as bad debt expense, which is included as a component of other operating expenses in the interim condensed consolidated statements of operations. The provision for doubtful accounts was $1,064,000 and $2,023,000 for the three months and six months ended June 30, 2018, respectively. The provision for doubtful accounts was $1,055,000 and $2,233,000 for the three months and six months ended June 30, 2017, respectively.

Medicare covers skilled nursing services for beneficiaries who require nursing care and/or rehabilitation services following a hospitalization of at least three consecutive days. For each eligible day a Medicare beneficiary is in a skilled nursing facility, Medicare pays the facility a daily payment, subject to adjustment for certain factors such as a wage index in the geographic area. The payment covers all services provided by the skilled nursing facility for the beneficiary that day, including room and board, nursing, therapy and drugs, as well as an estimate of capital–related costs to deliver those services.

For homecare services, Medicare pays based on the acuity level of the patient and based on episodes of care. An episode of care is defined as a length of care up to 60 days with multiple continuous episodes allowed. The services covered by the episode payment include all disciplines of care, in addition to medical supplies, within the scope of the home health benefit. We are allowed to make a request for anticipated payment at the start of care equal to 60% of the expected payment for the initial episode. The remaining balance due is paid following the submission of the final claim at the end of the episode. Deferred revenue is recorded for payments received for which the related services have not yet been provided

Medicaid is operated by individual states with the financial participation of the federal government. The states in which we operate currently use prospective cost–based reimbursement systems. Under cost–based reimbursement systems, the skilled nursing facility is reimbursed for the reasonable direct and indirect allowable costs it incurred in a base year in providing routine resident care services as defined by the program.

Private pay, managed care, and other payment sources include commercial insurance, individual patient funds, managed care plans and the Veterans Administration. Private paying patients, private insurance carriers and the Veterans Administration generally pay based on the healthcare facilities charges or specifically negotiated contracts. For private pay patients in skilled nursing, assisted living and independent living facilities, the Company bills for room and board charges, with the remittance being due on receipt of the statement and generally by the 10th day of the month the services are performed.

Certain managed care payors for homecare services pay on a per-visit basis. This non-episodic based revenue is recorded on an accrual basis based upon the date of services at amounts equal to its established or estimated per-visit rates.     

Third Party Payors

Laws and regulations governing the Medicare and Medicaid programs are complex and subject to interpretation. Noncompliance with such laws and regulations can be subject to regulatory actions including fines, penalties, and exclusion from the Medicare and Medicaid programs. We believe that we are in compliance with all applicable laws and regulations.

Medicare and Medicaid program revenues, as well as certain Managed Care program revenues, are subject to audit and retroactive adjustment by government representatives or their agents. The Medicare PPS methodology requires that patients be assigned to Resource Utilization Groups ("RUGs") based on the acuity level of the patient to determine the amount paid to us for patient services. The assignment of patients to the various RUG categories is subject to post–payment review by Medicare intermediaries or their agents. Settlements with third-party payors for retroactive adjustments due to audits, reviews or investigations are considered variable consideration and are included in the determination of the estimated transaction price for providing patient care. These settlements are estimated based on the terms of the payment agreement with the payor, correspondence from the payor and the Company’s historical settlement activity, including an assessment to ensure that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the retroactive adjustment is subsequently resolved. Estimated settlements are adjusted in future periods as adjustments become known, or as years are settled or are no longer subject to such audits, reviews, and investigations. We believe currently that any differences between the net revenues recorded and final determination will not materially affect the consolidated financial statements. We have made provisions of approximately $17,218,000 and $17,389,000 as of June 30, 2018 and December 31, 2017, respectively, for various Medicare, Medicaid, and Managed Care claims reviews and current and prior year cost reports.

Note 4 – Other Revenues

Revenues from rental income include health care real estate properties owned by us and leased to third party operators. Revenues from management and accounting services fees are generated by providing management and accounting services to third-party post-acute healthcare facilities. Revenues from insurance services include premiums for workers’ compensation and professional liability insurance policies that our wholly–owned insurance subsidiaries have written for third-party post-acute health care facilities to which we provide management or accounting services. "Other" revenues include miscellaneous health care related earnings.

Other revenues include the following:

Management Fees from National

We manage five skilled nursing facilities owned by National. For the three months and six months ended June 30, 2018, we recognized management fees and interest on management fees of $1,038,000 and $2,053,000 from these centers, respectively. For the three months and six months ended June 30, 2017, we recognized management fees and interest on management fees of $989,000 and $1,925,000 for these centers.

Insurance Services

For workers’ compensation insurance services, the premium revenues reflected in the interim condensed consolidated statements of operations for the three months and six months ended June 30, 2018 were $1,282,000 and $2,300,000, respectively. For the three months and six months ended June 30, 2017, the workers’ compensation premium revenues reflected in the interim condensed consolidated statements of operations were $1,409,000 and $2,688,000. Associated losses and expenses are reflected in the interim condensed consolidated statements of operations as "Salaries, wages and benefits."

For professional liability insurance services, the premium revenues reflected in the interim condensed consolidated statements of operations for the three months and six months ended June 30, 2018 were $673,000 and $1,346,000, respectively. For professional liability insurance services, the premium revenues reflected in the interim condensed consolidated statements of operations for the three months and six months ended June 30, 2017 were $678,000 and $956,000, respectively. Associated losses and expenses including those for self–insurance are included in the interim condensed consolidated statements of operations as "Other operating costs and expenses".

Note 5 – Non–Operating Income

Non–operating income includes equity in earnings (losses) of unconsolidated investments, dividends and other realized gains and losses on marketable securities, interest income, and unrealized losses on our equity marketable securities.

Our most significant equity method investment is a 75.1% non–controlling ownership interest in Caris HealthCare L.P. (“Caris”), a business that specializes in hospice care services. For the three months and six months ended June 30, 2018, Caris recorded expenses of $136,000 and $8,364,000, respectively, for the settlement of their Qui Tam legal matter. Please see Note 15 – Contingencies and Commitments for further detail describing the Caris’ legal investigation and settlement.

Note 6 – Business Segments

The Company has two reportable operating segments: (1) inpatient services, which includes the operation of skilled nursing facilities and assisted and independent living facilities, and (2) homecare services. These reportable operating segments are consistent with information used by the Company’s Chief Executive Officer, as CODM, to assess performance and allocate resources.

The Company also reports an “all other” category that includes revenues from rental income, management and accounting services fees, insurance services, and costs of the corporate office. For additional information on these reportable segments see Note 2 - Summary of Significant Accounting Policies.

The Company’s CODM evaluates performance and allocates capital resources to each segment based on an operating model that is designed to improve the quality of patient care and profitability of the Company while enhancing long-term shareholder value. The CODM does not review assets by segment in his resource allocation and therefore, assets by segment are not disclosed below.

The following table sets forth the Company’s unaudited interim condensed consolidated statements of operations by business segment (in thousands):

Note 7 – Long-Term Leases

Capital Leases

Fixed assets recorded under the capital leases, which are included in property and equipment in the interim condensed consolidated balance sheets, are as follows:

Operating Leases

The Company leases from National Health Investors, Inc. (“NHI”) the real property of 35 skilled nursing facilities, seven assisted living facilities and three independent living facilities under two separate lease agreements. Base rent expense under both lease agreements totals $34,200,000 annually with rent thereafter escalating by 4% of the increase in facility revenue over the base year. Total facility rent expense to NHI was $9,478,000 and $9,314,000 for the three months ended June 30, 2018 and 2017, respectively. Total facility rent expense to NHI was $18,956,000 and $18,628,000 for the six months ended June 30, 2018 and 2017, respectively.

Minimum Lease Payments

The approximate future minimum lease payments required under all leases that have remaining non-cancelable lease terms at June 30, 2018 are as follows:

Note 8 – Earnings per Share

Basic net income per share is computed based on the weighted average number of common shares outstanding for each period presented. Diluted net income per share reflects the potential dilution that would have occurred if securities to issue common stock were exercised, converted, or resulted in the issuance of common stock that would have then shared in our earnings.

The following table summarizes the earnings and the weighted average number of common shares used in the calculation of basic and diluted earnings per share (in thousands, except for share and per share amounts):

In the above table, options to purchase 1,137,015 and 1,124,689 shares of our common stock have been excluded for the quarter ended and six-months ended June 30, 2018 and 2017, respectively, due to their anti–dilutive impact.

Note 9 – Investments in Marketable Securities

Our investments in marketable equity securities are carried at fair value with the changes in unrealized gains and losses recognized in our results of operations at each measurement date. Our investments in marketable debt securities are classified as available for sale securities and carried at fair value with the unrealized gains and losses recognized through accumulated other comprehensive income at each measurement date. Realized gains and losses from securities sales are recognized in results of operations upon disposition of the securities using the specific identification method on a trade date basis. Refer to Note 10 - Fair Value Measurements for a description of the Company's methodology for determining the fair value of marketable securities.

Marketable securities and restricted marketable securities consist of the following (in thousands):

Included in the marketable equity securities are the following (in thousands, except share amounts):

The amortized cost and estimated fair value of the marketable debt securities classified as available for sale, by contractual maturity, are as follows (in thousands):

Gross unrealized gains related to marketable equity securities are $105,851,000 and $108,933,000 as of June 30, 2018 and December 31, 2017, respectively. Gross unrealized losses related to marketable equity securities are $11,000 and $24,000 as of June 30, 2018 and December 31, 2017, respectively. For the three months and six months ended June 30, 2018, the Company recognized a net unrealized gain of $12,448,000 and a net unrealized loss of $3,069,000, respectively, for the change in market value of the marketable equity securities in the interim condensed consolidated statements of operations.

Gross unrealized gains related to available for sale marketable debt securities are $110,000 and $823,000 as of June 30, 2018 and December 31, 2017, respectively. Gross unrealized losses related to available for sale marketable debt securities are $4,609,000 and $1,705,000 as of June 30, 2018 and December 31, 2017, respectively.

For the marketable securities in gross unrealized loss positions, (a) it is more likely than not that the Company will not be required to sell the investment securities before recovery of the unrealized losses, and (b) the Company expects that the contractual principal and interest will be received on the investment securities. As a result, the Company recognized no other-than-temporary impairment during the six months ended June 30, 2018 or for the year ended December 31, 2017.

Proceeds from the sale of available for sale marketable debt securities during the six months ended June 30, 2018 and 2017 were $4,399,000 and $44,756,000, respectively. Investment gains of $25,000 and $238,000 were realized on these sales during the six months ended June 30, 2018 and 2017, respectively. No sales were reported for the marketable equity securities for the six months ended June 30, 2018 and 2017, respectively.

Note 10 – Fair Value Measurements

The accounting standard for fair value measurements provides a framework for measuring fair value and requires expanded disclosures regarding fair value measurements. Fair value is defined as the price that would be received for an asset or the exit price that would be paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. This accounting standard establishes a fair value hierarchy, which requires an entity to maximize the use of observable inputs, where available. The following summarizes the three levels of inputs that may be used to measure fair value:

Level 1 – The valuation is based on quoted prices in active markets for identical instruments.

Level 2 – The valuation is based on observable inputs such as quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model–based valuation techniques for which all significant assumptions are observable in the market.

Level 3 – The valuation is based on unobservable inputs that are supported by minimal or no market activity and that are significant to the fair value of the instrument. Level 3 valuations are typically performed using pricing models, discounted cash flow methodologies, or similar techniques that incorporate management’s own estimates of assumptions that market participants would use in pricing the instrument, or valuations that require significant management judgment or estimation.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.

The following table summarizes fair value measurements by level at June 30, 2018 and December 31, 2017 for assets and liabilities measured at fair value on a recurring basis (in thousands):

Note 11 – Long–Term Debt

Long–term debt consists of the following:

$150,000,000 Credit Facility

During the second quarter of 2018, the Company lowered the available borrowing capacity of the credit facility from $175 million to $150 million.  The credit facility has a five-year maturity date (October 2020). Loans bear interest at either (i) LIBOR plus 1.40% or (ii) the base rate plus 0.40%.

Note 12 - Stock Repurchase Program

In August 2017, the Board of Directors authorized a common stock purchase program. The program will allow for repurchases of up to $25 million of its common stock. During the six months ended June 30, 2018, the Company repurchased 14,506 shares of its common stock for a total cost of $867,000. The shares were funded from cash on hand and were cancelled and returned to the status of authorized but unissued.

Note 13 – Stock–Based Compensation

NHC recognizes stock–based compensation expense for all stock options granted over the requisite service period using the fair value at the date of grant using the Black–Scholes pricing model. Stock–based compensation totaled $749,000 and $740,000 for the three months ended June 30, 2018 and 2017, respectively. Stock-based compensation totaled $1,177,000 and $832,000 for the six months ended June 30, 2018 and 2017, respectively. Stock–based compensation is included in “Salaries, wages and benefits” in the interim condensed consolidated statements of operations.

At June 30, 2018, the Company had $6,329,000 of unrecognized compensation cost related to unvested stock–based compensation awards. This unrecognized compensation cost will be amortized over an approximate four-year period.

Stock Options

The following table summarizes the significant assumptions used to value the options granted for the six months ended June 30, 2018 and for the year ended December 31, 2017.

The following table summarizes our outstanding stock options for the six months ended June 30, 2018 and for the year ended December 31, 2017.

Note 14 – Income Taxes

The income tax provision for the three months ended June 30, 2018 is $7,892,000 (an effective income tax rate of 26.1%). The income tax provision for the three months ended June 30, 2017 was $6,758,000 (an effective income tax rate of 39.0%). The income tax provision and effective tax rate for the three months ended June 30, 2017 were unfavorably impacted by adjustments to unrecognized tax benefits of $146,200 and nondeductible expenses of $84,000 but was favorably impacted by a tax benefit of $123,000 relating to the exercise of stock options, resulting in a net increase in the provision.

The income tax provision for the six months ended June 30, 2018 is $8,092,000 (an effective income tax rate of 29.4%). The income tax provision and effective tax rate for the six months ended June 30, 2018 were unfavorably impacted by nondeductible expenses of $881,000 (primarily the non-deductible portion of the estimated potential settlement of the Caris HealthCare, L.P. Qui Tam legal matter) or 3.2% of income before taxes for the six months. The income tax provision for the six months ended June 30, 2018 was also unfavorably impacted by the lower pre-tax book income resulting from the unrealized loss of $3,069,000 for the market value decrease in our marketable equity securities portfolio.  Prior to 2018, such market value changes ran through the balance sheet and did not impact our income statement.  The income tax provision for the six months ended June 30, 2017 was $14,757,000 (an effective income tax rate of 38.9%). The income tax provision and effective tax rate for the six months ended June 30, 2017 were unfavorably impacted by adjustments to unrecognized tax benefits of $321,000 and nondeductible expenses of $133,400 but was favorably impacted by a tax benefit of $244,000 relating to the exercise of stock options, resulting in a net increase in the provision.