Property and Equipment (Details) $ in Thousands		2 Months Ended	10 Months Ended	12 Months Ended
	Jul. 26, 2017 USD ($)	Dec. 31, 2016 USD ($) $ / Boe	Oct. 20, 2016 USD ($) $ / Boe	Dec. 31, 2017 USD ($) $ / Boe	Dec. 31, 2015 USD ($) $ / Boe	Oct. 21, 2016 USD ($)
Oil and gas properties, on the basis of full cost accounting
Proved properties		$ 573,150		$ 765,308
Unproved properties not being amortized		65,080		7,065
Other property and equipment		6,339		6,508		$ 6,210
Less accumulated depreciation, depletion, amortization and impairment		(12,974)		(204,419)
Net property and equipment		631,595		574,462		625,430
Other information
Capitalized qualifying share-based compensation expense		637		1,995
Proceeds from the sale of oil and gas equipment				4,235
Oil and Gas Properties
Other information
Depletion expense related to oil and gas properties		$ 12,600		$ 63,400
Depletion expense (per Boe) | $ / Boe		7.00		7.85
Costs capitalized to unevaluated properties		$ 700		$ 2,400
Internal costs capitalized to oil and gas properties		1,400		5,300
Capitalized qualifying share-based compensation expense		600		2,000
Gain or loss recognized on disposal of certain oil and gas equipment				0
Oil and Gas Properties | Disposed of by sale
Other information
Proceeds from the sale of oil and gas equipment				1,400
Oil and Gas Properties | Property at Lincoln County, Oklahoma | Disposed of by sale
Other information
Proceeds from the sale of oil and gas equipment	$ 7,000
Net proceeds from the sale of oil and gas equipment	$ 2,900
Other Property and Equipment
Other information
Depreciation		$ 400		$ 2,400
Predecessor
Oil and gas properties, on the basis of full cost accounting
Other property and equipment						12,175
Less accumulated depreciation, depletion, amortization and impairment						(3,449,241)
Net property and equipment						$ 358,877
Other information
Capitalized qualifying share-based compensation expense			$ 476		$ 1,347
Proceeds from the sale of oil and gas equipment					42,366
Predecessor | Oil and Gas Properties
Other information
Depletion expense related to oil and gas properties			$ 59,900		$ 195,200
Depletion expense (per Boe) | $ / Boe			6.84		16.26
Costs capitalized to unevaluated properties					$ 4,900
Internal costs capitalized to oil and gas properties			$ 3,400		7,300
Capitalized qualifying share-based compensation expense			500		1,300
Predecessor | Other Property and Equipment
Other information
Depreciation			$ 2,400		$ 3,500