Derivative Financial Instruments - Additional Information (Details) - Bank Of Montreal - Revolving Credit Facility - Ultra Resources, Inc. - Second Amendment	6 Months Ended
	Jun. 30, 2019
Derivative [Line Items]
Hedging percentage of quarterly projected volumes of natural gas from PDP reserves through september 29,2019	65.00%
Hedging percentage of quarterly projected volumes of natural gas from PDP reserves	50.00%
Minimum
Derivative [Line Items]
Hedging percentage of quarterly projected volumes of natural gas from PDP reserves through september 29,2019	65.00%
Hedging percentage of quarterly projected volumes of natural gas from PDP reserves	50.00%