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Restricted Cash and Cash Equivalents - Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 141,020,000 $ 95,073,000 $ 91,645,000  
Restricted cash and cash equivalents - current 0      
Restricted cash and investments - non-current 130,729,000 111,691,000 89,760,000  
Less Restricted investments - non-current (65,565,000)   (60,032,000)  
Total cash, cash equivalents and restricted cash and cash equivalents shown in the statement of cash flows $ 206,184,000 $ 143,843,000 $ 121,373,000 $ 548,322,000