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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 | $ 4,655,457 | $ 3,131,398 | $ 955,117
Net Changes in Sales Prices and Production Costs | (2,826,725) | 1,732,229 | 1,983,475
Sales Net of Production Costs | (1,130,685) | (995,630) | (831,131)
Net Change Due to Revisions in Quantity Estimates | (252,796) | 307,030 | (145,496)
Net Change Due to Extensions, Discoveries and Improved Recovery | 654,027 | 534,052 | 588,574
Development Costs Incurred During the Period | 739,874 | 844,081 | 544,809
Difference in Previously Estimated Development Costs Compared to Actual Costs Incurred During the Period | (323,922) | (434,817) | (129,427)
Purchase of Reserves In-Place | 0 | 209,630 | 0
Sales of Reserves In-Place | 0 | (434,103) | (55,277)
Changes in Estimated Future Development Costs | (24,469) | (49,294) | (233,017)
Net Change in Future Income Taxes | 409,797 | (507,410) | (404,582)
Timing and Other | 586,591 | (69,087) | 712,764
Accretion | 583,320 | 387,378 | 145,589
Total standardized measure of discounted net cash flows | $ 3,070,469 | $ 4,655,457 | $ 3,131,398

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