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CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except per share data) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating revenues and other income:      
Oil, gas, and NGL production revenue $ 1,126,188 $ 1,585,750 $ 1,636,357
Net gain on divestiture activity 91 862 426,917
Other operating revenues 394 3,493 3,798
Total operating revenues and other income 1,126,673 1,590,105 2,067,072
Operating expenses:      
Oil, gas, and NGL production expense 391,217 500,709 487,367
Depletion, depreciation, amortization, and asset retirement obligation liability accretion 784,987 823,798 665,313
Exploration 40,997 51,500 55,166
Impairment 1,016,013 33,842 49,889
General and administrative 99,160 132,797 116,504
Net derivative (gain) loss (161,576) 97,539 (161,832)
Other operating expense, net 24,825 19,888 18,328
Total operating expenses 2,195,623 1,660,073 1,230,735
Income (loss) from operations (1,068,950) (69,968) 836,337
Interest expense (163,892) (159,102) (160,906)
Net gain (loss) on extinguishment of debt 280,081 0 (26,740)
Other non-operating income (expense), net (3,944) (1,974) 3,086
Income (loss) before income taxes (956,705) (231,044) 651,777
Income tax (expense) benefit 192,091 44,043 (143,370)
Net income (loss) $ (764,614) $ (187,001) $ 508,407
Basic weighted-average common shares outstanding 113,730 112,544 111,912
Diluted weighted-average common shares outstanding 113,730 112,544 113,502
Basic net income (loss) per common share $ (6.72) $ (1.66) $ 4.54
Diluted net income (loss) per common share $ (6.72) $ (1.66) $ 4.48