Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Components of Long-Term Debt (Parenthetical) (Details)

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Long-Term Debt - Components of Long-Term Debt (Parenthetical) (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 07, 2016
May 31, 2015
11.00% 1.5 Lien Term Loan, Due November 2019        
Debt Instrument [Line Items]        
Debt instrument interest rate 11.00% 11.00%    
Debt instrument maturity date Nov. 15, 2019 Nov. 15, 2019    
9.00 % Second Lien Term Loan, Due May 2020        
Debt Instrument [Line Items]        
Debt instrument interest rate 9.00% 9.00%   9.00%
Debt instrument maturity date May 15, 2020 May 15, 2020    
9.00%/10.75% Second Lien PIK Toggle Notes, Due May 2020        
Debt Instrument [Line Items]        
Debt instrument interest rate 9.00% 9.00% 9.00%  
Debt instrument maturity date May 15, 2020 May 15, 2020    
Debt instrument paid in kind interest rate 10.75% 10.75%    
8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021        
Debt Instrument [Line Items]        
Debt instrument interest rate 8.50% 8.50% 8.50%  
Debt instrument maturity date Jun. 15, 2021 Jun. 15, 2021    
Debt instrument paid in kind interest rate 10.00% 10.00%    
8.50% Unsecured Senior Notes, Due June 2019        
Debt Instrument [Line Items]        
Debt instrument interest rate 8.50% 8.50%    
Debt instrument maturity date Jun. 15, 2019 Jun. 15, 2019