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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating revenues        
Oil and gas sales $ 232,577 $ 90,509 $ 424,968 $ 283,278
Operating expenses        
Lease operating expenses 22,976 25,839 48,837 58,478
Severance and ad valorem taxes 15,784 5,696 28,367 22,269
Gathering, processing and transportation expenses 19,494 17,284 40,119 34,223
Depreciation, depletion and amortization 73,429 93,020 137,212 194,278
Impairment and abandonment expense 9,199 19,425 18,399 630,725
Exploration and other expenses 1,764 4,051 2,859 8,060
General and administrative expenses 28,807 17,994 54,063 36,864
Total operating expenses 171,453 183,309 329,856 984,897
Net gain (loss) on sale of long-lived assets (8) (2) 36 243
Proceeds from terminated sale of assets 5,983 0 5,983 0
Income (loss) from operations 67,099 (92,802) 101,131 (701,376)
Other income (expense)        
Interest expense (15,182) (17,371) (32,667) (33,792)
Gain (loss) on extinguishment of debt (22,156) 143,443 (22,156) 143,443
Net gain (loss) on derivative instruments (54,959) (29,857) (106,158) (38,362)
Other income (expense) 143 1 150 (52)
Total other income (expense) (92,154) 96,216 (160,831) 71,237
Income (loss) before income taxes (25,055) 3,414 (59,700) (630,139)
Income tax (expense) benefit 0 1,916 0 85,124
Net income (loss) (25,055) 5,330 (59,700) (545,015)
Less: Net (income) loss attributable to noncontrolling interest 0 0 0 2,362
Net income (loss) attributable to Class A Common Stock $ (25,055) $ 5,330 $ (59,700) $ (542,653)
Income (loss) per share of Class A Common Stock:        
Basic (USD per share) $ (0.09) $ 0.02 $ (0.21) $ (1.96)
Diluted (USD per share) $ (0.09) $ 0.02 $ (0.21) $ (1.96)