Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Cash and Cash Equivalents The Company considers all highly liquid investments with original maturities of three months or less to be cash equivalents. At times, cash and cash equivalent balances may exceed federally insured limits. Management believes that the Company mitigates any risks by depositing cash and investing in cash equivalents with major financial institutions. Insurance The Company is subject to medical malpractice and other lawsuits due to the nature of the services the Company provides. A portion of the Company’s professional liability risks are insured through a wholly-owned insurance subsidiary providing coverage for up to $5.0 million per claim and $10.0 million for certain other claims through August 31, 2023 and $7.0 million and $10.0 million for certain other claims thereafter. The Company has obtained reinsurance coverage from a third-party to cover claims in excess of those limits. The reinsurance policy has a coverage limit of $75.0 million or $70.0 million in the aggregate for certain other claims through August 31, 2023 and $78.0 million or $75.0 million in the aggregate for certain other claims thereafter. The Company’s reinsurance receivables are recognized consistent with the related liabilities and include known claims and any incurred but not reported claims that are covered by current insurance policies in place. The reserve for professional and general liability risks was estimated based on historical claims, prior settlements and judgments, industry trends, severity factors, and other actuarial assumptions. The estimated accrual for professional and general liabilities could be significantly affected should current and future occurrences differ from historical claim trends and expectations. While claims are monitored closely when estimating professional and general liability accruals, the complexity of the claims and wide range of potential outcomes often hampers timely adjustments to the assumptions used in these estimates. The Company recorded unfavorable adjustments of $5.3 million and $5.9 million to our estimated liability for self-insured professional and general liability claims during the years ended December 31, 2023 and 2022, respectively, relating to the settlement or expected settlement of certain prior year claims. The professional and general liability reserve was $109.4 million at December 31, 2023, of which $12.5 million was included in other accrued liabilities and $96.9 million was included in other long-term liabilities. The professional and general liability reserve was $103.6 million at December 31, 2022, of which $12.1 million was included in other accrued liabilities and $91.5 million was included in other long-term liabilities. The Company estimates receivables for the portion of professional and general liability reserves that are recoverable under the Company’s insurance policies. Such receivable was $62.3 million at December 31, 2023, of which $33.6 million was included in other current assets and $28.7 million was included in other assets, and such receivable was $37.8 million at December 31, 2022, of which $10.2 million was included in other current assets and $27.6 million was included in other assets. The Company’s statutory workers’ compensation program is fully insured with a $0.5 million deductible per accident. The workers’ compensation liability was $26.8 million at December 31, 2023, of which $12.0 million was included in accrued salaries and benefits and $14.8 million was included in other long-term liabilities, and such liability was $24.2 million at December 31, 2022, of which $12.0 million was included in accrued salaries and benefits and $12.2 million was included in other long-term liabilities. The reserve for workers compensation claims was based upon independent actuarial estimates of future amounts that will be paid to claimants. Management believes that adequate provisions have been made for workers’ compensation and professional and general liability risk exposures. Property and Equipment and Other Long-Lived Assets Property and equipment are recorded at cost. Depreciation is calculated on the straight-line basis over the estimated useful lives of the assets, which typically range from 10 to 50 years for buildings and improvements, three to seven years for equipment and the shorter of the lease term or estimated useful lives for leasehold improvements. When assets are sold or retired, the corresponding cost and accumulated depreciation are removed from the related accounts and any gain or loss is recorded in the period of sale or retirement. Repair and maintenance costs are expensed as incurred. Depreciation expense was $132.3 million, $117.8 million and $106.7 million for the years ended December 31, 2023, 2022 and 2021, respectively. The carrying values of long-lived assets are reviewed for possible impairment whenever events, circumstances or operating results indicate that the carrying amount of an asset may not be recoverable. If this review indicates that the asset will not be recoverable, as determined based upon the undiscounted cash flows of the operating asset over the remaining useful life, the carrying value of the asset will be reduced to its estimated fair value. Fair value estimates are based on independent appraisals, market values of comparable assets or internal evaluations of future net cash flows. During the year ended December 31, 2023, the Company recorded non-cash property impairment charges of $2.0 million related to the closure of certain facilities, which is included in loss on impairment in the condensed consolidated statements of operations. During the second quarter of 2021, the Company opened a 260-bed replacement facility in Pennsylvania and recorded a non-cash property impairment charge of $23.2 million for the existing facility. Additionally, during the third quarter of 2021, the Company recorded a $1.1 million non-cash property impairment charge for one facility in Louisiana resulting from hurricane damage, both of which are included in loss on impairment on the condensed consolidated statements of operations. The Company performed an impairment review of long-lived assets in the fourth quarter of 2023, 2022 and 2021 and recorded no impairment. Goodwill and Indefinite-Lived Intangible Assets The Company’s goodwill and other indefinite-lived intangible assets, which consist of licenses and accreditations, trade names and certificates of need intangible assets that are not amortized, are evaluated for impairment annually during the fourth quarter or more frequently if events indicate the carrying value of a reporting unit may not be recoverable. As of the Company’s annual impairment tests on October 1, 2023, 2022 and 2021, the Company had one reporting unit, behavioral healthcare services. The fair value of the Company’s behavioral healthcare services reporting unit substantially exceeded its carrying value, and therefore no impairment was recorded. During the year ended December 31, 2023, the Company recorded non-cash indefinite-lived intangible asset impairment charges of $5.4 million related to the closure of certain facilities, which is included in loss on impairment in the condensed consolidated statements of operations. During the second quarter of 2021, the Company sold one outpatient facility for $4.3 million and recorded a write down of $1.8 million of goodwill and $0.2 million of intangible assets related to the disposition. During the fourth quarter of 2021, the Company sold one outpatient facility for $1.5 million and recorded a write down of $0.7 million of goodwill and $0.1 million of intangibles related to the disposition. Stock Compensation The Company measures and recognizes the cost of employee services received in exchange for awards of equity instruments based on the grant-date fair value in accordance with the Financial Accounting Standards Board (the “FASB”) Accounting Standards Codification (“ASC”) 718, “ Compensation — Stock Compensation.” The Company uses the Black-Scholes valuation model to determine grant-date fair value for stock options and recognizes straight-line amortization of share-based compensation expense over the requisite service period of the respective awards. The fair values of performance stock units are determined based on the closing price of the Company’s common stock on the trading date immediately prior to the grant date for units subject to performance conditions. Earnings Per Share Basic and diluted earnings per share are calculated in accordance with FASB ASC 260, “Earnings Per Share,” based on the weighted-average number of shares outstanding in each period and dilutive stock options and non-vested shares, to the extent such securities have a dilutive effect on earnings per share. Income Taxes The Company uses the asset and liability method of accounting for income taxes. Under this method, deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes and net operating loss and tax credit carryforwards. The amount of deferred taxes on these temporary differences is determined using the tax rates that are expected to apply in the period when the asset is realized or the liability is settled, as applicable, based on tax rates and laws in the respective tax jurisdiction enacted as of the balance sheet date. The Company reviews its deferred tax assets for recoverability and establishes a valuation allowance based on historical taxable income, projected future taxable income, applicable tax strategies, and the expected timing of the reversals of existing temporary differences. A valuation allowance is provided when it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company records a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return. The Company recognizes interest and penalties, if any, related to unrecognized tax benefits in income tax expense. The Company has accruals for taxes and associated interest that may become payable in future years as a result of audits by tax authorities. The Company accrues for tax contingencies when it is more likely than not that a liability to a taxing authority has been incurred and the amount of the contingency can be reasonably estimated. Although management believes that the positions taken on previously filed tax returns are reasonable, the Company nevertheless has established tax and interest reserves in recognition that various taxing authorities may challenge the positions taken by the Company resulting in additional liabilities for taxes and interest. These amounts are reviewed as circumstances warrant and adjusted as events occur that affect our potential liability for additional taxes, such as lapsing of applicable statutes of limitations, conclusion of tax audits, additional exposure based on current calculations, identification of new issues, release of administrative guidance, or rendering of a court decision affecting a particular tax issue. Recent Accounting Pronouncements In December 2023, the FASB issued Accounting Standards Update (“ASU”) 2023-09 “Income Taxes (“Topic 740”) “Improvements to Income Tax Disclosures Topic 740”. ASU 2023-09 is intended to enhance the transparency and decision usefulness of income tax disclosures. This guidance is effective for fiscal years beginning after December 15, 2024, with early adoption permitted, and may be applied either prospectively or retrospectively. The Company is currently evaluating the impact of ASU 2023-09 on the Company’s consolidated financial statements. In November 2021, the FASB issued ASU 2021-10, “Government Assistance (Topic 832)” (“ASU 2021-10”). ASU 2021-10 provides guidance to increase the transparency of government assistance including the disclosure of (1) the types of assistance, (2) an entity’s accounting for the assistance, and (3) the effect of the assistance on an entity’s financial statements. ASU 2021-10 applies to all business entities except for not-for-profit entities within the scope of Topic 958, Not-for-Profit Entities, and employee benefit plans within the scope of Topic 960, Plan Accounting — Defined Benefit Pension Plans, Topic 962, Plan Accounting — Defined Contribution Pension Plans, and Topic 965, Plan Accounting — Health and Welfare Benefit Plans that account for a transaction with a government by applying a grant or contribution accounting model by analogy to other accounting guidance (for example, a grant model within IAS 20, Accounting for Government Grants and Disclosure of Government Assistance, or Subtopic 958-605, Not-For-Profit Entities — Revenue Recognition). ASU 2021-10 is effective for fiscal years beginning after December 15, 2021. The Company adopted ASU 2021-10 for the year ended December 31, 2022. See Note 10 – The CARES Act for additional information on the Company’s accounting for government grants received. In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (“ASU 2020-04”). ASU 2020-04 provides optional guidance for a limited period of time to ease the potential burden in accounting for or recognizing the effects of reference rate reform on financial reporting and applies only to contracts, hedging relationships and other transactions that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform. ASU 2020-04 is effective as of March 12, 2020 through December 31, 2024. Entities may adopt ASU 2020-04 as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020 or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020, up to the date that the financial statements are available to be issued. The Company adopted ASU 2020-04 for the quarter ended March 31, 2023. See Note 13 - Long Term Debt for additional information on the Company’s accounting for the reference rate reform. There is no significant impact on the Company’s consolidated financial statements.