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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 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted cash and restricted investments | $ 34,451 | $ 26,958 | $ 52,628
Current restricted cash | 21,932 | 14,492 |
Total current restricted cash and restricted investments | 21,932 | 14,492 |
Non-current restricted cash | 12,519 | 12,466 |
Total non-current restricted cash and restricted investments | 12,519 | 12,466 |
Collateral for letters of credit for facility leases |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted cash and restricted investments | 2,132 | 2,269 |
Collateral with financial institutions |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted cash and restricted investments | 10,966 | 10,912 |
Claims processing services |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted cash and restricted investments | $ 21,353 | $ 13,777 |

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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-8 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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