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Supplemental Gas Data (unaudited) Results of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Extractive Industries [Abstract] |  |  |  |  |
Natural Gas, NGLs and Oil Revenue |  |  | $ 1,364,325 | $ 1,577,937 | $ 1,125,224
Gain (Loss) on Commodity Derivative Instruments |  |  | 376,105 | (30,212) | 206,930
Gas Royalty Interests and Purchased Gas Sales |  |  | 94,027 | 65,986 | 53,795
Total Revenue |  |  | 1,834,457 | 1,613,711 | 1,385,949
Lease Operating Expense |  |  | 65,443 | 95,139 | 88,932
Production, Ad Valorem, and Other Fees |  |  | 27,461 | 32,750 | 29,267
Transportation, Gathering and Compression |  |  | 516,879 | 424,206 | 382,865
Purchased Gas Costs |  |  | 90,553 | 64,817 | 52,597
Impairment of Exploration and Production Properties | $ 327,400 | $ 18,650 | 327,400 | 0 | 137,865
Impairment of Unproved Properties and Expirations |  |  | 119,429 | 0 | 0
Exploration Costs |  |  | 44,380 | 12,033 | 48,074
DD&A |  |  | 474,352 | 461,149 | 412,036
Total Costs |  |  | 1,665,897 | 1,090,094 | 1,151,636
Pre-tax Operating Income / (Loss) |  |  | 168,560 | 523,617 | 234,313
Income Tax Benefit |  |  | 78,398 | 102,629 | (348,676)
Results of Operations for Producing Activities excluding Corporate and Interest Costs |  |  | $ 90,162 | $ 420,988 | $ 582,989

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