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Supplemental Gas Data (unaudited) - Change in Standardized Measure of Discounted Future Net Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]      
Balance at Beginning of Period $ 2,635,736 $ 3,070,469 $ 4,655,457
Net Changes in Sales Prices and Production Costs 5,272,386 (695,216) (2,944,555)
Sales Net of Production Costs (1,220,971) (1,007,676) (824,360)
Net Change Due to Revisions in Quantity Estimates (334,660) 322,820 (252,796)
Net Change Due to Extensions, Discoveries and Improved Recovery 699,710 268,196 654,027
Development Costs Incurred During the Period 393,641 434,273 739,874
Difference in Previously Estimated Development Costs Compared to Actual Costs Incurred During the Period (33,175) (129,642) (323,922)
Changes in Estimated Future Development Costs 31,406 (499,316) (24,469)
Net Change in Future Income Taxes (1,231,883) 138,404 409,797
Accretion 329,782 390,391 583,320
Timing and Other (660,396) 343,033 398,096
Total Discounted Cash Flow at End of Period $ 5,881,576 $ 2,635,736 $ 3,070,469