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Fair Value Measurements - Carrying Value and the Estimated Fair Value of Company Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Secured Loan, fair value $ 0 $ 15,915
Senior Secured Loan, carrying value 0 15,858
Debt, fair value 481,809 503,028
Debt, carrying value 459,118 491,575
Quoted Price in Active Markets for Identical Assets and Liabilities (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Secured Loan, fair value 0 0
Debt, fair value 0 0
Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Secured Loan, fair value 0 15,915
Debt, fair value 481,809 503,028
Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Secured Loan, fair value 0 0
Debt, fair value $ 0 $ 0