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Debt - ABL Credit Facility (Details) - USD ($)
Jul. 24, 2018
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Principal amount of long-term debt   $ 672,973,000 $ 416,466,000
Revolving Credit Facility | ABL Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility, increase $ 10,000,000    
Maximum borrowing amount $ 85,000,000    
Revolving Credit Facility | ABL Revlover      
Debt Instrument [Line Items]      
Principal amount of long-term debt   0 0
Line of credit facility, borrowing base   53,700,000  
Letters of credit outstanding, amount   $ 100,000 $ 13,500,000