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Supplemental Gas Data (unaudited) - Results of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Extractive Industries [Abstract]          
Natural Gas, NGLs and Oil Revenue     $ 896,745 $ 1,364,325 $ 1,577,937
Realized Gain (Loss) on Commodity Derivative Instruments     461,217 69,780 (69,720)
Unrealized (Loss) Gain on Commodity Derivative Instruments     (288,235) 306,325 39,508
Purchased Gas Revenue     105,792 94,027 65,986
Total Revenue     1,175,519 1,834,457 1,613,711
Lease Operating Expense     40,407 65,443 95,139
Production, Ad Valorem and Other Fees     24,196 27,461 32,750
Transportation, Gathering and Compression     285,683 330,539 302,933
Purchased Gas Costs     100,902 90,553 64,817
Impairment of Exploration and Production Properties $ 61,849 $ 327,400 61,849 327,400 0
Impairment of Unproved Properties and Expirations $ 473,045 $ 119,429 0 119,429 0
Exploration Costs     14,994 44,380 12,033
Depreciation, Depletion and Amortization     501,821 508,463 493,423
Total Costs     1,029,852 1,513,668 1,001,095
Pre-tax Operating Income     145,667 320,789 612,616
Income Tax Expense     42,098 149,167 120,073
Results of Operations for Producing Activities excluding Corporate and Interest Costs     $ 103,569 $ 171,622 $ 492,543