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Organization and Summary of Accounting Policies - Medicare Accelerated Payments and Deferred Governmental Grants (Details) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Proceeds from grants received | $ 2,000,000 | $ 27,000,000 |
Grant funds | 2,400,000 | 37,900,000 | $ 46,200,000
Unrecognized grant funds received | 3,000,000 | 4,000,000 |
Repayments of grants received | 60,000,000 | 60,000,000 |
Coronavirus Aid, Relief, and Economic Security Act CARES Act, Government Grants, Deferred Accelerated Payments |  | 60,000,000 |
Current deferred accrued payroll and benefits | $ 0 | $ 8,500,000 |

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