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Fair Value of Financial Instruments - Fair Value Disclosures (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents $ 365 $ 15,617 $ 150,132
Long-Term Debt (Excluding Debt Issuance Costs) 2,435,406 2,424,001  
Restricted Cash, Current Portion 220,386 735 733
Restricted Cash, Less Current Portion 0 5,247 $ 5,456
Carrying Amount      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents 365 15,617  
Restricted Cash 220,386 5,982  
Long-Term Debt (Excluding Debt Issuance Costs) 2,453,932 2,450,853  
Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents 365 15,617  
Restricted Cash 220,386 5,982  
Long-Term Debt (Excluding Debt Issuance Costs) $ 2,719,220 $ 2,638,251