Long-Term Debt (Details) $ in Thousands		1 Months Ended	2 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
	Apr. 19, 2017 USD ($)	Apr. 22, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Apr. 22, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Bank Borrowings and New Credit Facility
Document Period End Date						Jun. 30, 2017
Debtor-in-Possession Financing
Plan of Reogranization, percentage of common stock lenders to receive net of backstop fee		88.50%			88.50%
Debtor-in-Possession Financing, Amount Arranged		$ 75,000			$ 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%			88.50%
Debtor-in-Possession Financing, Amount Arranged		$ 75,000			$ 75,000
Debtor-in-Possession Financing, Fee on Unused Borrowings		3.00%			3.00%
Line of Credit [Member] | New Credit Facility [Member]
Bank Borrowings and New Credit Facility
Long-term Debt, Excluding Current Maturities				$ 211,000		$ 211,000	$ 198,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 600,000
Line of Credit Facility, Current Borrowing Capacity	330,000	$ 320,000			$ 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				211,000		211,000	$ 198,000
Interest expense including amortization of debt issuance costs			$ 4,257	4,642		8,249
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		400
Successor [Member] | Line of Credit [Member] | New Credit Facility [Member]
Bank Borrowings and New Credit Facility
Interest expense including amortization of debt issuance costs				4,600		8,200
Write off of Deferred Debt Issuance Cost				1,900
Commitment fees included in interest expense, net				$ 100		$ 200
Predecessor [Member]
Bank Borrowings and New Credit Facility
Interest expense including amortization of debt issuance costs		5,281			13,347
Write off of Deferred Debt Issuance Cost					0
Predecessor [Member] | DIP Facility [Member]
Bank Borrowings and New Credit Facility
Interest expense including amortization of debt issuance costs		4,500			6,400
Predecessor [Member] | Senior Notes [Member]
Bank Borrowings and New Credit Facility
Interest expense including amortization of debt issuance costs					0
Senior Notes
Contractual Interest on senior notes subject to compromise		4,200			21,554
Predecessor [Member] | Line of Credit [Member]
Bank Borrowings and New Credit Facility
Interest expense including amortization of debt issuance costs		$ 700			6,800
Capitalized interest on our unproved properties					$ 0