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Fair Value Measurements - Carrying Value and the Estimated Fair Value of Company Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Secured Loan, fair value $ 15,915 $ 55,000
Senior Secured Loan, carrying value 15,858 54,492
Debt, fair value 503,028 455,159
Debt, carrying value 491,575 462,097
Quoted Price in Active Markets for Identical Assets and Liabilities (Level 1) [Member]    
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) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Secured Loan, fair value 15,915 55,000
Debt, fair value 503,028 455,159
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Secured Loan, fair value 0 0
Debt, fair value $ 0 $ 0