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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues and other income:      
Revenues and other income $ 1,780,986 $ 2,600,934 $ 3,333,837
Derivative fair value income (loss) 187,711 226,681 (51,192)
Total revenues and other income 1,968,697 2,827,615 3,282,645
Costs and expenses:      
Production and ad valorem taxes 24,617 37,967 46,149
Brokered natural gas and marketing 188,316 359,892 496,047
Exploration 32,654 36,683 34,117
Abandonment and impairment of unproved properties 19,334 1,235,342 514,994
General and administrative 159,415 181,109 209,812
Exit and termination costs 547,409 9,506 (373)
Deferred compensation plan 12,541 (15,472) (18,631)
Interest 192,667 194,285 210,209
Gain on early extinguishment of debt (14,068) (5,415) 0
Depletion, depreciation and amortization 394,330 548,843 635,467
Impairment of proved properties and other assets 78,955 1,095,634 22,614
Impairment of goodwill 0 0 1,641,197
(Gain) loss on the sale of assets (110,791) 30,256 10,666
Total costs and expenses 2,706,026 5,044,203 5,059,615
Loss before income taxes (737,329) (2,216,588) (1,776,970)
Income tax (benefit) expense:      
Current (523) 6,147 0
Deferred (25,029) (506,438) (30,489)
Total (benefit) expense for income taxes (25,552) (500,291) (30,489)
Net loss $ (711,777) $ (1,716,297) $ (1,746,481)
Net loss per common share:      
Basic $ (2.95) $ (6.92) $ (7.10)
Diluted $ (2.95) $ (6.92) $ (7.10)
Weighted average common shares outstanding:      
Basic 241,373 247,970 246,171
Diluted 241,373 247,970 246,171
Natural Gas, NGLs and Oil Sales      
Revenues and other income:      
Revenues and other income $ 1,607,713 $ 2,255,425 $ 2,851,077
Brokered Natural Gas, Marketing and Other      
Revenues and other income:      
Revenues and other income 173,273 345,509 482,760
Direct Operating      
Costs and expenses:      
Costs and expenses 92,157 136,276 139,531
Transportation, Gathering, Processing and Compression      
Costs and expenses:      
Costs and expenses $ 1,088,490 $ 1,199,297 $ 1,117,816