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Fair Value Measurements - Carrying Value and Estimated Fair Value of Company Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Assets    
Total Fair Value $ 10,928 $ 15,915
Liabilities    
Total Fair Value 494,429 503,028
Carrying Value 459,008 491,575
Senior secured loan, net 10,914 15,858
Quoted Price in Active Markets for Identical Assets and Liabilities (Level 1)    
Assets    
Total Fair Value 0 0
Liabilities    
Total Fair Value 0 0
Significant Other Observable Inputs (Level 2)    
Assets    
Total Fair Value 10,928 15,915
Liabilities    
Total Fair Value 494,429 503,028
Significant Unobservable Inputs (Level 3)    
Assets    
Total Fair Value 0 0
Liabilities    
Total Fair Value $ 0 $ 0