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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
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 | $ 3,070,469 | $ 4,655,457 | $ 3,131,398
Net Changes in Sales Prices and Production Costs | (819,247) | (2,826,725) | 1,732,229
Sales Net of Production Costs | (719,441) | (1,130,685) | (995,630)
Net Change Due to Revisions in Quantity Estimates | 322,820 | (252,796) | 307,030
Net Change Due to Extensions, Discoveries and Improved Recovery | 268,196 | 654,027 | 534,052
Development Costs Incurred During the Period | 434,273 | 739,874 | 844,081
Difference in Previously Estimated Development Costs Compared to Actual Costs Incurred During the Period | (129,642) | (323,922) | (434,817)
Purchase of Reserves In-Place | 0 | 0 | 209,630
Sales of Reserves In-Place | 0 | 0 | (434,103)
Changes in Estimated Future Development Costs | (499,316) | (24,469) | (49,294)
Net Change in Future Income Taxes | 138,404 | 409,797 | (507,410)
Timing and Other | 390,391 | 586,591 | (69,087)
Accretion | 178,829 | 583,320 | 387,378
Total Discounted Cash Flow at End of Period | $ 2,635,736 | $ 3,070,469 | $ 4,655,457

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