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Fair Value Measurements - Carrying Value and Estimated Fair Value of Company Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Assets    
Senior secured loan, fair value $ 0 $ 15,915
Senior secured loan, carrying value 0 15,858
Liabilities    
Debt, fair value 495,763 503,028
Debt, carrying value 459,044 491,575
Quoted Price in Active Markets for Identical Assets and Liabilities (Level 1)    
Assets    
Senior secured loan, fair value 0 0
Liabilities    
Debt, fair value 0 0
Significant Other Observable Inputs (Level 2)    
Assets    
Senior secured loan, fair value 0 15,915
Liabilities    
Debt, fair value 495,763 503,028
Significant Unobservable Inputs (Level 3)    
Assets    
Senior secured loan, fair value 0 0
Liabilities    
Debt, fair value $ 0 $ 0