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Fair Value Measurements - Carrying Value and Estimated Fair Value of Company Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets    
Senior secured loan, fair value $ 15,915 $ 55,000
Senior secured loan, carrying value 15,816 54,492
Liabilities    
Debt, fair value 450,569 455,159
Debt, carrying value 442,486 462,097
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 15,915 55,000
Liabilities    
Debt, fair value 450,569 455,159
Significant Unobservable Inputs (Level 3)    
Assets    
Senior secured loan, fair value 0 0
Liabilities    
Debt, fair value $ 0 $ 0