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Debt - Components of Debt, Interest Expense and Effective Interest Rate (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Oct. 12, 2016
Debt Instrument [Line Items]      
Interest Expense $ 2,673 $ 2,179  
Senior Credit Facility 2017 [Member]      
Debt Instrument [Line Items]      
Interest Expense $ 173 $ 0  
Effective Interest Rate 6.30% 0.00%  
13.5% Convertible Second Lien Notes [Member]      
Debt Instrument [Line Items]      
Interest Expense $ 2,500 $ 1,927  
Effective Interest Rate 24.60% 24.20%  
Unamortized discount $ 900 $ 500  
Paid-in kind interest $ 1,600 1,400  
Stated interest rate 13.50%   13.50%
Exit Credit Facility [Member]      
Debt Instrument [Line Items]      
Interest Expense $ 0 $ 252  
Effective Interest Rate 0.00% 6.10%