Properties and Equipment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Wells	Dec. 31, 2020 USD ($) Wells	Dec. 31, 2019 USD ($) Wells	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Proved Natural Gas and Crude Oil Properties	$ 8,310,018	$ 7,523,639
Unproved Natural Gas and Crude Oil Properties	306,181	350,677
Total Natural Gas and Crude Oil Properties	8,616,199	7,874,316
Equipment and other	63,099	65,027
Land and Buildings	19,928	24,299
Construction in Progress	371,968	523,550
Property and Equipment, at cost	9,071,194	8,487,192
Accumulated DD&A	(4,256,329)	(3,627,993)
Property, Plant and Equipment, Net	4,814,865	4,859,199
Capitalized Exploratory Well Costs	0	7,459	$ 16,078	$ 12,188
Capitalized Exploratory Well Cost, Additions Pending Determination of Proved Reserves	5,902	11,770	31,901
Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves	$ (13,361)	$ (20,389)	$ (28,011)
Wells to be completed | Wells	0	2	4