Supplemental disclosures to the consolidated statements of cash flows (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Mar. 21, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net cash provided by operating activities included:
Cash payments for interest			$ 13,196
Interest capitalized			(1,245)
Cash payments for interest, net of amounts capitalized			11,951
Cash payments for income taxes			150
Cash payments for reorganization items			16,930
Non-cash investing activities included:
Asset retirement obligation additions and revisions			2,746
Change in accrued oil and gas capital expenditures			$ 10,598
Predecessor
Net cash provided by operating activities included:
Cash payments for interest	$ 4,105			$ 19,899
Interest capitalized	(248)			(1,741)
Cash payments for interest, net of amounts capitalized	3,857			18,158
Cash payments for income taxes				250
Cash payments for reorganization items	11,405			4,255
Non-cash financing activities included:
Repayment of Prior Credit Facility with proceeds from early termination of derivative contracts (See Note 7)		$ 103,560		103,560
Non-cash investing activities included:
Asset retirement obligation additions and revisions	716			4,015
Change in accrued oil and gas capital expenditures	$ 5,387			$ (22,543)