Fresh Start Accounting - Cumulative Impact of the Reorganization Adjustments (Details) - Reorganization Adjustments [Member] $ in Thousands	Apr. 22, 2016 USD ($)
Fresh-Start Adjustment [Line Items]
Gain on settlement of Liabilities subject to compromise	$ (863,938)
Fair value of equity issued in excess of DIP principal	(67,329)
Fair value of equity and warrants issued to Predecessor stockholders	(23,544)
Fair value of equity issued to DIP lenders for backstop fee	(16,082)
Other reorganization adjustments	(1,800)
Cancellation of Predecessor Company equity	775,429
Net impact to accumulated deficit	1,530,612
Cancellation of Predecessor Company equity	$ (775,429)