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Basis of Presentation, Summary of Significant Accounting Policies and Change in Accounting Principles - Restricted Cash and Restricted Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  |  | $ 88,662 |  |
Current restricted cash |  | $ 14,492 | 75,685 |  |
Total current restricted cash and restricted investments |  | 14,492 | 75,685 |  |
Non-current restricted cash |  | 12,466 | 12,977 |  |
Total non-current restricted cash and restricted investments |  | 12,466 | 12,977 |  |
Cash and cash equivalents |  | 188,200 | 266,280 |  |
Restricted cash and restricted investments |  | 26,958 | 88,662 |  |
Total cash and cash equivalents and restricted cash shown in the consolidated statements of cash flows | [1] | 215,158 | 354,942 | $ 361,581 | $ 128,531
Collateral for letters of credit for facility leases |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 2,269 | 3,769 |  |
Collateral with financial institutions |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 10,912 | 11,662 |  |
Claims processing services |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 13,777 | 73,226 |  |
Other |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | $ 0 | $ 5 |  |
[1] | As a result of the closing of the sale of True Health during the first quarter of 2021, the consolidated statement of operations and related financial information reflect the Company’s operations and assets and liabilities of True Health as discontinued operations. Cash flows and comprehensive income have not been adjusted and are included in the consolidated statements of cash flows and consolidated statements of comprehensive income (loss) for the years ended December 31, 2021 and 2020. See Note 5.

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