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Supplemental Gas Data (unaudited) - Results of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Extractive Industries [Abstract] |  |  |  |
Natural Gas, NGLs and Oil Revenue |  | $ 2,183,929 | $ 896,745 | $ 1,364,325
Realized (Loss) Gain on Commodity Derivative Instruments |  | (539,016) | 461,217 | 69,780
Unrealized (Loss) Gain on Commodity Derivative Instruments |  | (1,093,717) | (288,235) | 306,325
Purchased Gas Revenue |  | 99,713 | 105,792 | 94,027
Total Revenue |  | 650,909 | 1,175,519 | 1,834,457
Lease Operating Expense |  | 46,256 | 40,407 | 65,443
Production, Ad Valorem and Other Fees |  | 34,051 | 24,196 | 27,461
Transportation, Gathering and Compression |  | 343,635 | 285,683 | 330,539
Purchased Gas Costs |  | 93,776 | 100,902 | 90,553
Impairment of Exploration and Production Properties | $ 327,400 | 0 | 61,849 | 327,400
Impairment of Unproved Properties and Expirations |  | 0 | 0 | 119,429
Exploration Costs |  | 20,626 | 14,994 | 44,380
Depreciation, Depletion and Amortization |  | 515,118 | 501,821 | 508,463
Total Costs |  | 1,053,462 | 1,029,852 | 1,513,668
Pre-tax Operating (Loss) Income |  | (402,553) | 145,667 | 320,789
Income Tax (Benefit) Expense |  | (87,354) | 42,098 | 149,167
Results of Operations for Producing Activities excluding Corporate and Interest Costs |  | $ (315,199) | $ 103,569 | $ 171,622

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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 + Details
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