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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
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted funds $ 29,259 $ 21,644 $ 31,447  
Current restricted cash 16,509 14,374    
Total current restricted cash and restricted investments 16,509 14,374    
Non-current restricted cash 12,750 6,654    
Total non-current restricted cash and restricted investments 12,750 6,654    
Cash and cash equivalents 252,496 319,002 370,514  
Restricted cash and restricted investments 29,259 21,644 31,447  
Restricted investments included in restricted cash and restricted investments 0   (1,410)  
Total cash and cash equivalents and restricted cash shown in the consolidated statements of cash flows (1) [1] 281,755 361,581 $ 400,551 $ 128,531
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 3,410 3,510    
Restricted cash and restricted investments 3,410 3,510    
Collateral with financial institutions        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted funds 11,957 4,743    
Restricted cash and restricted investments 11,957 4,743    
Claims processing services        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted funds 13,169 12,064    
Restricted cash and restricted investments 13,169 12,064    
Other        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted funds 723 1,327    
Restricted cash and restricted investments 723 1,327    
Bank time deposits        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted funds 12,000 4,700    
Restricted cash and restricted investments $ 12,000 $ 4,700    
[1] As a result of the closing of the sale of True Health SPA, the consolidated statements of operations, consolidated balance sheets, and related financial information reflect the Company’s operations and assets and liabilities of True Health as discontinued operations for all periods presented. 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 all periods presented. See Note 5.