Debt (Details) $ / shares in Units, $ in Thousands	Oct. 21, 2016 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)	Oct. 20, 2016 USD ($)	Apr. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 02, 2015 USD ($)	May 21, 2015 USD ($)	May 31, 2013 USD ($)	Oct. 01, 2012 USD ($)
Debt
Principal		$ 128,059
Total debt		128,059
Exit Facility
Debt
Principal		128,059
Total debt		128,059
2016 Reorganization
Maximum borrowing capacity		170,000
Debt issuance costs associated with the Exit Facility		$ 1,187
Bankruptcy Reorganization Chapter 11 | Plan Support Agreement | Exit Facility
2016 Reorganization
Permanent pay-down	$ 81,300
Anticipated borrowing base after emergence from bankruptcy	170,000
Maximum borrowing capacity	170,000			$ 170,000
Predecessor
Debt
Principal					$ 1,795,930
Unamortized Deferred Gain on Debt Forgiven					(119,654)
Unamortized Debt Issuance Costs					(24,640)
Total debt					1,890,944
2020 Senior Notes | Predecessor
Debt
Principal					293,625				$ 600,000
Unamortized Debt Issuance Costs					(11,344)
Total debt					282,281
2021 Senior Notes | Predecessor
Debt
Principal					347,652			$ 700,000
Unamortized Debt Issuance Costs					(13,296)
Total debt					334,356
Second Lien Notes
2016 Reorganization
Permanent pay-down	60,000
Second Lien Notes | Bankruptcy Reorganization Chapter 11 | Plan Support Agreement
2016 Reorganization
Permanent pay-down	$ 60,000
Equity allocated to holders of debt (as a percent)	96.25
Second Lien Notes | Predecessor
Debt
Principal					625,000
Unamortized Deferred Gain on Debt Forgiven					(42,293)
Total debt					667,293
Third Lien Notes | Bankruptcy Reorganization Chapter 11 | Plan Support Agreement | Warrants
2016 Reorganization
Equity allocated to holders of debt (as a percent)	2.5
Warrants to acquire common stock shares (in shares) | shares	4,411,765
Warrant strike price (in dollars per share) | $ / shares	$ 24.00
Warrants expiration term	42 months
Third Lien Notes | Predecessor
Debt
Principal					529,653	$ 20,000	$ 504,100
Unamortized Deferred Gain on Debt Forgiven					(77,361)
Total debt					$ 607,014
Unsecured Notes | Bankruptcy Reorganization Chapter 11 | Plan Support Agreement | Warrant B
2016 Reorganization
Equity allocated to holders of debt (as a percent)	1.25
Warrants to acquire common stock shares (in shares) | shares	2,213,789
Warrant strike price (in dollars per share) | $ / shares	$ 46.00
Warrants expiration term	42 months
Senior Revolving Credit Facility, due 2018
2016 Reorganization
Permanent pay-down	$ 121,300
Senior Revolving Credit Facility, due 2018 | Predecessor
2016 Reorganization
Maximum borrowing capacity			$ 750,000