Emergence from Voluntary Reorganization under Chapter 11 Proceedings Emergence from Voluntary Reorganization under Chapter 11 Proceedings (Details) - USD ($) $ in Thousands		4 Months Ended
	Apr. 15, 2016	Apr. 22, 2016	Apr. 19, 2017
Plan of Reorganization [Abstract]
Debt and Accrued Interest		$ 906,000
Debtor-in-Possession Financing, Amount Arranged		$ 75,000
Plan of Reogranization, percentage of common stock lenders to receive net of backstop fee		88.50%
Plan of Reorganization, backstop fee		7.50%
Plan of Reorganization, Percentage of Common Stock existing equity holders to retain		4.00%
Plan or Reorganization, warrants existing equity holders		30.00%
Plan of Reorganization, Percentage of Common Stock Registration Rights Holder to receive		5.00%
Net Proceeds from Texegy Deal	$ 46,900
DIP Facility [Member]
Plan of Reorganization [Abstract]
Debtor-in-Possession Financing, Amount Arranged		$ 75,000
Line of Credit [Member] | New Credit Facility [Member]
Plan of Reorganization [Abstract]
Line of Credit Facility, Current Borrowing Capacity		320,000	$ 330,000
Predecessor [Member] | Senior Notes [Member]
Plan of Reorganization [Abstract]
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations		$ 21,600