Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Schedule of Fair Value of Derivatives and Long-Term Debt (Parenthetical) (Details)

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Fair Value Measurements - Schedule of Fair Value of Derivatives and Long-Term Debt (Parenthetical) (Details)
12 Months Ended
Oct. 18, 2018
Dec. 31, 2018
Dec. 31, 2017
9.75% Senior Second Lien Notes, Due November 2023      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Debt instrument interest rate 9.75% 9.75% 9.75%
Debt instrument maturity date Nov. 01, 2023 Nov. 01, 2023 Nov. 01, 2023
11.00% 1.5 Lien Term Loan, Due November 2019      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [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      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Debt instrument interest rate   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      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Debt instrument interest rate   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      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Debt instrument interest rate   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      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Debt instrument interest rate   8.50% 8.50%
Debt instrument maturity date   Jun. 15, 2019 Jun. 15, 2019