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Fair Value of Financial Instruments - Fair Value Relating to Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Mar. 31, 2018
Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Amount outstanding under letters of credit   $ 1,187  
Carrying Value | ABL Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Credit facilities $ 165,467 40,300  
Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Amount outstanding under letters of credit 1,177 1,187  
Fair Value | ABL Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Credit facilities 165,467 40,300  
Secured Debt | Term Loan Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt 461,966    
Secured Debt | Equipment Note      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt 8,503 9,628  
Secured Debt | Carrying Value | Equipment Note      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt   9,629  
Secured Debt | Fair Value | Term Loan Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt 461,966    
Secured Debt | Fair Value | Equipment Note      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt 8,503 $ 9,629  
Bank of America, N.A.      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Amount outstanding under letters of credit $ 1,177   $ 1,231