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Fair Value of Financial Instruments - Fair Value Disclosures (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents $ 39,365 $ 15,617 $ 19,607
Long-Term Debt (Excluding Debt Issuance Costs) 2,289,068 2,424,001  
Carrying Amount      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents 39,365 15,617  
Long-Term Debt (Excluding Debt Issuance Costs) 2,313,927 2,450,853  
Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents 39,365 15,617  
Long-Term Debt (Excluding Debt Issuance Costs) $ 2,594,481 $ 2,638,251