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(Termination of Material Definitive Agreements, Sale of Equity Securities and Reorganization Value) (Details) - USD ($)
Oct. 05, 2016
Dec. 31, 2017
Dec. 31, 2016
Oct. 02, 2016
Oct. 01, 2016
Jan. 11, 2016
Fresh-Start Adjustment [Line Items]            
Common stock, shares issued (in shares)   25,047,000 25,002,000      
Common stock, par value (in usd per share)   $ 0.01 $ 0.01      
Reorganization value       $ 687,500,000    
Excess cash       64,000,000    
Minimum cash balance assumption       $ 250,000,000    
Minimum            
Fresh-Start Adjustment [Line Items]            
Reorganization value         $ 650,000,000  
Maximum            
Fresh-Start Adjustment [Line Items]            
Reorganization value         $ 950,000,000  
Discounted cash flow valuation technique | Minimum            
Fresh-Start Adjustment [Line Items]            
Discount rate (percent) 13.25%          
Discounted cash flow valuation technique | Maximum            
Fresh-Start Adjustment [Line Items]            
Discount rate (percent) 15.25%          
7.00% senior notes due 2019 at par            
Fresh-Start Adjustment [Line Items]            
Senior notes interest rate (percent)           7.00%
7.25% senior notes due 2020 at par            
Fresh-Start Adjustment [Line Items]            
Senior notes interest rate (percent)           7.25%
7.25% senior notes due 2021 at par            
Fresh-Start Adjustment [Line Items]            
Senior notes interest rate (percent)           7.25%
9.875% senior notes ($375.0 million face value) due 2019            
Fresh-Start Adjustment [Line Items]            
Senior notes interest rate (percent)           9.875%
8.00% senior secured notes due 2019 at par            
Fresh-Start Adjustment [Line Items]            
Senior notes interest rate (percent)           8.00%
Class A Common Stock            
Fresh-Start Adjustment [Line Items]            
Common stock, shares issued (in shares)       24,589,834    
Common stock, par value (in usd per share) $ 0.01          
Aggregate number of securities called by warrants (in shares) 1,914,856     1,914,856    
Class B Common Stock            
Fresh-Start Adjustment [Line Items]            
Common stock, shares issued (in shares)       410,166    
Common stock, par value (in usd per share)       $ 0.01    
New first lien debt facility | Senior notes            
Fresh-Start Adjustment [Line Items]            
Amount of debt instrument $ 326,500,000.0