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Fair Value Measurements - Schedule of Senior Secured Credit Facility (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Transfer of asset fair value Level 1 to 2 $ 0  
Transfer of liability fair value Level 1 to 2 0  
Transfer of asset fair value Level 2 to 1 0  
Transfer of liability fair value Level 2 to 1 0  
Carrying amounts | 2016 Senior Secured Credit Facility    
Debt Instrument [Line Items]    
Long term debt, carrying amount 229,901 $ 230,820
Fair Value, Inputs, Level 2 | Estimated fair value | 2016 Senior Secured Credit Facility    
Debt Instrument [Line Items]    
Long term debt, fair value $ 233,821 $ 233,240