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Related Party Transactions (Details)				1 Months Ended	2 Months Ended	3 Months Ended		11 Months Ended	12 Months Ended
Related Party Transactions (Details)	Nov. 09, 2018 USD ($) well	Feb. 08, 2018 USD ($)	Dec. 31, 2016 USD ($)	Feb. 08, 2018 USD ($)	Dec. 31, 2018 USD ($) well	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) well	Dec. 31, 2018 USD ($) well	Dec. 31, 2018 USD ($) well	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 29, 2017 USD ($)	Jan. 13, 2016 well
Related Party Transaction [Line Items]
General and administrative								$ 114,735,000
Advances from related party					$ 9,822,000		$ 9,822,000	9,822,000	$ 9,822,000
Notes receivable from related party					0		0	0	0
Related party receivables					24,282,000		24,282,000	24,282,000	24,282,000
Long-term note receivable					0		0	0	0
8% long-term note receivable
Related Party Transaction [Line Items]
Allowance for uncollectible accounts					13,400,000		13,400,000	13,400,000	13,400,000
BCE
Related Party Transaction [Line Items]
Advances from related party					9,839,000		9,839,000	9,839,000	9,839,000
NWGP
Related Party Transaction [Line Items]
Promissory note receivable												$ 1,500,000
Debt Instrument, Interest Rate, Stated Percentage												8.00%
Notes receivable from related party					1,700,000		1,700,000	1,700,000	1,700,000	$ 1,500,000
Long-term note receivable					$ 11,700,000		$ 11,700,000	$ 11,700,000	$ 11,700,000	10,800,000
HMS \| 8% long-term note receivable
Related Party Transaction [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					8.00%		8.00%	8.00%	8.00%
Related party receivables					$ 8,500,000		$ 8,500,000	$ 8,500,000	$ 8,500,000
High Mesa
Related Party Transaction [Line Items]
Accounts receivable, related party					23,400,000		23,400,000	23,400,000	$ 23,400,000
Predecessor
Related Party Transaction [Line Items]
General and administrative				$ 21,234,000						55,671,000	$ 40,468,000
Advances from related party										23,390,000
Notes receivable from related party										0
Related party receivables										790,000
Long-term note receivable										12,369,000
Predecessor \| BCE
Related Party Transaction [Line Items]
Advances from related party										23,400,000
Kingfisher
Related Party Transaction [Line Items]
Shortfall fee reimbursement percent									50.00%
Accounts payable, related party					100,000		100,000	100,000	$ 100,000
Land consulting services \| Vice President \| David Murrell, VP of Land and Business Development
Related Party Transaction [Line Items]
Expenditures under arrangement with related party								166,000
General and administrative								8,523
Land consulting services \| Predecessor \| Vice President \| David Murrell, VP of Land and Business Development
Related Party Transaction [Line Items]
Expenditures under arrangement with related party		$ 28,000								186,000	146,000
Compensation To Related Party \| Vice President \| David Mcclure Vp Of Facilities And Midstream
Related Party Transaction [Line Items]
Total compensation								1,157,774
Compensation To Related Party \| Landman \| David Pepper, Landman And Cousin Of VP Of Land And Business Development
Related Party Transaction [Line Items]
Total compensation								297,134
Compensation To Related Party \| Predecessor \| Vice President \| David Mcclure Vp Of Facilities And Midstream
Related Party Transaction [Line Items]
Total compensation										250,000	425,000
Employee benefits and share-based compensation				28,874
Compensation To Related Party \| Predecessor \| Landman \| David Pepper, Landman And Cousin Of VP Of Land And Business Development
Related Party Transaction [Line Items]
Total compensation										150,000	180,000
Employee benefits and share-based compensation				67,322
Long-term note receivable from HMS \| HMS \| 8% long-term note receivable
Related Party Transaction [Line Items]
Interest income note receivable								900,000
Long-term note receivable from HMS \| Predecessor \| HMS \| 8% long-term note receivable
Related Party Transaction [Line Items]
Interest income note receivable				$ 100,000					900,000	800,000
High Mesa Agreement \| High Mesa
Related Party Transaction [Line Items]
Long-term note receivable					10,000,000		$ 10,000,000	10,000,000	10,000,000
Initial term							180 days
Renewal term							180 days
Required notice period to terminate agreement							90 days
Management fee							$ 10,000
Costs incurred prior to 2018										800,000
Allowance for uncollectible accounts					9,000,000		9,000,000	9,000,000	9,000,000
High Mesa Agreement \| Predecessor \| High Mesa
Related Party Transaction [Line Items]
Long-term note receivable										$ 800,000
KFM \| High Mesa
Related Party Transaction [Line Items]
Number of produced water disposal wells sold \| well	20
Proceeds from sale of business	$ 98,000,000
Proceeds from sale of water systems	$ 90,000,000
Accounts receivable, related party					8,000,000		8,000,000	8,000,000	8,000,000
Expenditures under arrangement with related party					4,700,000
Initial term	15 years
Joint Development Agreement \| BCE
Related Party Transaction [Line Items]
Advances from related party					$ 39,500,000		$ 39,500,000	$ 39,500,000	$ 39,500,000
Number of wells drilled \| well					61		61	61	61
Joint Development Agreement \| Predecessor
Related Party Transaction [Line Items]
Number of wells to be drilled in three tranches \| well													60
Number of additional wells to be drilled \| well													20
Reduced interest (percent)			12.50%
Internal rate of return			25.00%
Joint Development Agreement \| Predecessor \| BCE
Related Party Transaction [Line Items]
Percent committed to fund			100.00%
Drilling and completion costs (maximum)			$ 3,200,000								$ 3,200,000
Working interest received (percent)			80.00%
Reduced interest (percent)			20.00%
Internal rate of return			15.00%
Subsequent Event \| High Mesa
Related Party Transaction [Line Items]
Accounts receivable, related party						$ 22,400,000
Payment received						1,000,000
Subsequent Event \| High Mesa Agreement \| High Mesa
Related Party Transaction [Line Items]
Contract receivable						$ 900,000