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Fair Value Measurements and Interest Rate Swaps - Fair Value of Certain Financial Assets and Liabilities and Other Financial Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value $ 1,048,699 $ 1,090,099
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value 1,048,699 1,090,099
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value $ 1,078,900 $ 1,110,353