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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating revenues and other income: |  |  |  |  |  |
Oil, gas, and NGL production revenue | $ 1,585,750 | [1] | $ 1,636,357 | [2] | $ 1,253,783 | [3]
Net gain (loss) on divestiture activity | 862 |  | 426,917 |  | (131,028) |
Other operating revenues | 3,493 |  | 3,798 |  | 6,621 |
Total operating revenues and other income | 1,590,105 |  | 2,067,072 |  | 1,129,376 |
Operating expenses: |  |  |  |  |  |
Oil, gas, and NGL production expense | 500,709 |  | 487,367 |  | 507,906 |
Depletion, depreciation, amortization, and asset retirement obligation liability accretion | 823,798 |  | 665,313 |  | 557,036 |
Exploration | 51,500 |  | 55,166 |  | 54,713 |
Impairment of oil and gas properties | 33,842 |  | 49,889 |  | 16,078 |
General and administrative | 132,797 |  | 116,504 |  | 117,283 |
Net derivative (gain) loss | 97,539 |  | (161,832) |  | 26,414 |
Other operating expenses, net | 19,888 |  | 18,328 |  | 13,667 |
Total operating expenses | 1,660,073 |  | 1,230,735 |  | 1,293,097 |
Income (loss) from operations | (69,968) |  | 836,337 |  | (163,721) |
Interest expense | (159,102) |  | (160,906) |  | (179,257) |
Loss on extinguishment of debt | 0 |  | (26,740) |  | (35) |
Other non-operating income (expense), net | (1,974) |  | 3,086 |  | (800) |
Income (loss) before income taxes | (231,044) |  | 651,777 |  | (343,813) |
Income tax (expense) benefit | 44,043 |  | (143,370) |  | 182,970 |
Net income (loss) | $ (187,001) |  | $ 508,407 |  | $ (160,843) |
Basic weighted-average common shares outstanding | 112,544 |  | 111,912 |  | 111,428 |
Diluted weighted-average common shares outstanding | 112,544 |  | 113,502 |  | 111,428 |
Basic net income (loss) per common share | $ (1.66) |  | $ 4.54 |  | $ (1.44) |
Diluted net income (loss) per common share | $ (1.66) |  | $ 4.48 |  | $ (1.44) |
[1] | Note: Amounts may not calculate due to rounding.
[2] | Note: Amounts may not calculate due to rounding.
[3] | Note: Amounts may not calculate due to rounding.

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