Commitments and Contingencies (Details)					6 Months Ended
	Mar. 26, 2018 plaintiff defendant	Apr. 20, 2017 USD ($)	Jan. 17, 2017	Aug. 15, 2016 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2016	Dec. 31, 2014
Drilling Rigs
Loss Contingencies [Line Items]
Operating lease, term					15 months		15 months
CO2 Compressor
Loss Contingencies [Line Items]
Operating lease, term					7 years			84 months	84 months
Naylor Farms Case
Loss Contingencies [Line Items]
Minimum percentage of plaintiff in modified class			60.00%
Lacheverjuan Bennett et al. v. Chaparral Energy, L.L.C., et al.
Loss Contingencies [Line Items]
Number of individual plaintiffs | plaintiff	27
Number of named defendants including parent | defendant	23
Number of unnamed defendants | defendant	25
Pending Litigation | Naylor Farms Case Putative Class Action | Low
Loss Contingencies [Line Items]
Damages sought				$ 150,000,000	$ 5,000,000
Pending Litigation | Naylor Farms Case Actual and Putative Action | Low
Loss Contingencies [Line Items]
Damages sought		$ 90,000,000
Pending Litigation | Hallco Petroleum, Inc. v. Chaparral Energy, L.L.C. | Low
Loss Contingencies [Line Items]
Damages sought					75,000
Letter of Credit
Loss Contingencies [Line Items]
Letters of credit outstanding					869,000		$ 869,000
Proceeds from letters					0	$ 0
Cash payments for interest					$ 0	$ 0