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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  |  | $ 21,028 |  |
Current restricted cash |  | $ 75,685 | 14,374 |  |
Total current restricted cash and restricted investments |  | 75,685 | 14,374 |  |
Non-current restricted cash |  | 12,977 | 6,654 |  |
Total non-current restricted cash and restricted investments |  | 12,977 | 6,654 |  |
Cash and cash equivalents |  | 266,280 | 340,490 |  |
Restricted cash and restricted investments |  | 88,662 | 21,707 |  |
Restricted investments included in restricted cash and restricted investments |  | 0 | (616) |  |
Total cash and cash equivalents and restricted cash shown in the consolidated statements of cash flows | [1] | 354,942 | 361,581 | $ 128,531 | $ 388,325
Discontinued Operations, Disposed of by Sale | True Health |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Non-current restricted investments |  |  | 600 |  |
Current restricted cash from claims processing services |  |  | 100 |  |
Collateral for letters of credit for facility leases |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 3,769 | 3,510 |  |
Collateral with financial institutions |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 11,662 | 4,743 |  |
Claims processing services |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 73,226 | 12,064 |  |
Other |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 5 | 711 |  |
Bank time deposits |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | $ 11,700 | $ 4,700 |  |
[1] | See Note 5.

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