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Supplemental Information on Oil and Natural Gas Producing Activities (Unaudited) - Results of Operations from Oil and Natural Gas Producing Activities (Unaudited) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Dec. 31, 2018	Dec. 31, 2017
Successor
Results of Operations for Oil and Gas Producing Activities
Revenues	$ 98,456		$ 349,395	$ 357,299
Expenses
Production costs	27,640		112,173	116,372
Depreciation and depletion	36,061		127,281	118,035
Impairment	319,087		0	0
Total expenses	382,788		239,454	234,407
Income (loss) before income taxes	(284,481)		109,272	121,803
Income tax expense (benefit)	(112,427)		28,520	47,722
Results of operations for oil and natural gas producing activities (excluding corporate overhead and interest costs)	(172,054)		80,752	74,081
Predecessor
Results of Operations for Oil and Gas Producing Activities
Revenues		$ 293,809
Expenses
Production costs		135,715
Depreciation and depletion		90,978
Impairment		657,392
Total expenses		884,085
Income (loss) before income taxes		(604,114)
Income tax expense (benefit)		(229,986)
Results of operations for oil and natural gas producing activities (excluding corporate overhead and interest costs)		(374,128)
Oil, natural gas and NGL | Successor
Results of Operations for Oil and Gas Producing Activities
Revenues	$ 98,307		$ 348,726	$ 356,210
Oil, natural gas and NGL | Predecessor
Results of Operations for Oil and Gas Producing Activities
Revenues		$ 279,971

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