Supplemental Cash Flow Information (Supplemental Disclosures to the Consolidated Statements of Cash Flows) (Details) - USD ($)	1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 08, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental cash flow information:
Cash paid for interest		$ 47,862,000
Cash paid for state income taxes, net of refunds		4,000
Non-cash investing and financing activities:
Increase in asset retirement obligations		5,665,000
Asset retirement obligations assumed on purchased properties		0
Increase in accruals or payables for capital expenditures		5,389,000
Increase in accounts payable to related party for capital expenditures		4,082,000
Increase in withholding tax accruals for share-based compensation	$ 0	535,000	$ 0	$ 0
Distribution of non-STACK assets, net of liabilities		0
Contribution of interests in oil and gas properties		0		65,700,000
Contribution receivable		$ 0
Predecessor
Supplemental cash flow information:
Cash paid for interest	1,145,000		47,773,000	74,694,000
Cash paid for state income taxes, net of refunds	0		0	285,000
Non-cash investing and financing activities:
Increase in asset retirement obligations	0		4,363,000	2,719,000
Asset retirement obligations assumed on purchased properties	0		702,000	0
Increase in accruals or payables for capital expenditures	4,896,000		71,995,000	12,375,000
Increase in accounts payable to related party for capital expenditures	0		7,646,000	0
Distribution of non-STACK assets, net of liabilities	43,482,000		0	0
Contribution of interests in oil and gas properties	0		0	65,740,000
Contribution receivable	$ 0		$ 0	$ 7,875,000