Fresh Start Accounting - Reorganization Items (Details) - USD ($) $ in Thousands	4 Months Ended	5 Months Ended
	Apr. 22, 2016	Sep. 30, 2016
Successor [Member]
Fresh-Start Adjustment [Line Items]
Gain on settlement of liabilities subject to compromise		$ 0
Fair value of equity issued in excess of DIP principal		0
Fresh start adjustments		0
Reorganization legal and professional fees and expenses		1,595
Fair Value of Equity Issued for Backstop Fee		0
Other reorganization items		(126)
(Gain) Loss on Reorganization items, net		$ 1,469
Predecessor [Member]
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
Fresh start adjustments	(222,512)
Reorganization legal and professional fees and expenses	25,573
Fair Value of Equity Issued for Backstop Fee	16,082
Other reorganization items	21,324
(Gain) Loss on Reorganization items, net	$ (956,142)