Fresh Start Accounting - Assumptions to estimate FV of Warrants (Details) - Fresh Start Adjustments	Oct. 21, 2016 item $ / shares
Assumptions used to estimate fair value of warrants
Risk free rate utilized (as a percent)	2.20%
Warrants
Assumptions used to estimate fair value of warrants
Number of peer companies to estimate volatility | item	6
Warrants | Minimum
Assumptions used to estimate fair value of warrants
Expected volatility (as a percent)	30.10%
Warrants | Maximum
Assumptions used to estimate fair value of warrants
Expected volatility (as a percent)	54.20%
Warrants | Third Lien Notes
Assumptions used to estimate fair value of warrants
Risk free rate utilized (as a percent)	1.04%
Expected life (in years)	3 years 6 months
Expected volatility (as a percent)	55.00%
Warrant strike price (in dollars per share)	$ 24.00
Calculated fair value	$ 6.74
Warrants | Unsecured Notes
Assumptions used to estimate fair value of warrants
Risk free rate utilized (as a percent)	1.04%
Expected life (in years)	3 years 6 months
Expected volatility (as a percent)	55.00%
Warrant strike price (in dollars per share)	$ 46.00
Calculated fair value	$ 3.42