Long-Term Debt (Details) $ in Thousands		3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Apr. 19, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Apr. 22, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Bank Borrowings and New Credit Facility
Document Period End Date						Sep. 30, 2017
Debtor-in-Possession Financing
Debtor-in-Possession Financing, Amount Arranged				$ 75,000
DIP Facility [Member]
Debtor-in-Possession Financing
Plan of Reogranization, percentage of common stock lenders to receive net of backstop fee				88.50%
Debtor-in-Possession Financing, Amount Arranged				$ 75,000
Debtor-in-Possession Financing, Fee on Unused Borrowings				3.00%
Line of Credit [Member] | New Credit Facility [Member]
Bank Borrowings and New Credit Facility
Long-term Debt, Excluding Current Maturities		$ 250,000				$ 250,000	$ 198,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 600,000
Line of Credit Facility, Current Borrowing Capacity	330,000			$ 320,000
Line of Credit, Letters of Credit Issuable	$ 25,000
Commitment fee basis points for the credit facility	0.50%
Line of Credit, Additional Interest Due to Payment Default	2.00%
Line of Credit, Required Security Interest on Oil and Gas Properties	85.00%
Line of Credit, Covenant, Debt to EBITDA Ratio, Minimum	4.0
Line of Credit, Covenant, Current Ratio, Minimum	1.0
Line of Credit [Member] | New Credit Facility [Member] | Minimum [Member] | Alternative Base Interest Rate [Member]
Bank Borrowings and New Credit Facility
Debt instrument escalating basis spread on base rate	0.0175
Debt Instrument Escalating Rates for Eurodollar Rate Loans	0.0275
Line of Credit [Member] | New Credit Facility [Member] | Maximum [Member] | Alternative Base Interest Rate [Member]
Bank Borrowings and New Credit Facility
Debt instrument escalating basis spread on base rate	0.0275
Debt Instrument Escalating Rates for Eurodollar Rate Loans	0.0375
Successor [Member]
Bank Borrowings and New Credit Facility
Long-term Debt, Excluding Current Maturities		250,000				250,000	$ 198,000
Gross interest expense including amortization of debt issuance costs		2,868	$ 5,880		$ 10,137	11,117
Write off of Deferred Debt Issuance Cost					0	2,401
Successor [Member] | Line of Credit [Member]
Bank Borrowings and New Credit Facility
Capitalized interest on our unproved properties		200	300		300	500
Successor [Member] | Line of Credit [Member] | New Credit Facility [Member]
Bank Borrowings and New Credit Facility
Gross interest expense including amortization of debt issuance costs		3,000	6,100		10,400	11,600
Commitment fees included in interest expense, net		$ 100	$ 100		$ 100	$ 400
Predecessor [Member]
Bank Borrowings and New Credit Facility
Gross interest expense including amortization of debt issuance costs				13,347
Write off of Deferred Debt Issuance Cost				0
Predecessor [Member] | DIP Facility [Member]
Bank Borrowings and New Credit Facility
Gross interest expense including amortization of debt issuance costs				6,400
Predecessor [Member] | Senior Notes [Member]
Bank Borrowings and New Credit Facility
Gross interest expense including amortization of debt issuance costs				0
Senior Notes
Contractual Interest on senior notes subject to compromise				21,554
Predecessor [Member] | Line of Credit [Member]
Bank Borrowings and New Credit Facility
Gross interest expense including amortization of debt issuance costs				6,800
Capitalized interest on our unproved properties				$ 0