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(Securitization Facility and Warrant Agreement) (Details) - USD ($)
Oct. 05, 2016
Dec. 31, 2017
Dec. 31, 2016
Oct. 02, 2016
Fresh-Start Adjustment [Line Items]        
Common stock, par value (in usd per share)   $ 0.01 $ 0.01  
Number of securities called by each warrant (in shares) 1      
Exercise price of warrants (in usd per share) $ 57      
Percentage of listed common stock 90.00%      
Number of shares of common stock underlying warrant multiplier $ 0      
Class A Common Stock        
Fresh-Start Adjustment [Line Items]        
Aggregate number of securities called by warrants (in shares) 1,914,856     1,914,856
Common stock, par value (in usd per share) $ 0.01