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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

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