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Debt - ABL Credit Facility (Details) - Revolving Credit Facility - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Dec. 21, 2017
ABL Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing amount     $ 75,000,000
ABL Revlover      
Debt Instrument [Line Items]      
Line of credit facility, amount outstanding $ 0 $ 0  
Line of credit facility, borrowing base $ 57,000,000