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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.