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CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
OPERATING REVENUES |  |  |
Operating revenue | $ 2,143,716 | $ 1,747,293 | $ 1,194,627
Gain (loss) on derivative instruments | 44,432 | 16,926 | (38,950)
TOTAL OPERATING REVENUES | 2,188,148 | 1,764,219 | 1,155,677
OPERATING EXPENSES |  |  |
Direct operations | 69,646 | 102,310 | 100,696
Taxes other than income | 22,642 | 33,487 | 29,223
Exploration | 113,820 | 21,526 | 27,662
Depreciation, depletion and amortization | 417,479 | 568,817 | 590,128
Impairment of oil and gas properties | 0 | 482,811 | 435,619
General and administrative | 96,641 | 97,786 | 85,633
TOTAL OPERATING EXPENSES | 1,401,157 | 1,803,428 | 1,716,288
Earnings (loss) on equity method investments | 1,137 | (100,486) | (2,477)
Loss on sale of assets | (16,327) | (11,565) | (1,857)
INCOME (LOSS) FROM OPERATIONS | 771,801 | (151,260) | (564,945)
Interest expense, net | 73,201 | 82,130 | 88,336
Loss on debt extinguishment | 0 | 0 | 4,709
Other expense (income) | 463 | (4,955) | 1,609
Income (loss) before income taxes | 698,137 | (228,435) | (659,599)
Income tax expense (benefit) | 141,094 | (328,828) | (242,475)
NET INCOME (LOSS) | $ 557,043 | $ 100,393 | $ (417,124)
Earnings (loss) per share |  |  |
Basic (in dollars per share) | $ 1.25 | $ 0.22 | $ (0.91)
Diluted (in dollars per share) | $ 1.24 | $ 0.22 | $ (0.91)
Weighted-average common shares outstanding |  |  |
Basic (in shares) | 445,538 | 463,735 | 456,847
Diluted (in shares) | 447,568 | 465,551 | 456,847
Dividends per common share (in dollars per share) | $ 0.25 | $ 0.17 | $ 0.08
Natural gas |  |  |
OPERATING REVENUES |  |  |
Operating revenue | $ 1,881,150 | $ 1,506,078 | $ 1,022,590
Crude oil and condensate |  |  |
OPERATING REVENUES |  |  |
Operating revenue | 48,722 | 212,338 | 151,106
Brokered natural gas |  |  |
OPERATING REVENUES |  |  |
Operating revenue | 209,530 | 17,217 | 13,569
OPERATING EXPENSES |  |  |
Operating expenses | 184,198 | 15,252 | 10,785
Other |  |  |
OPERATING REVENUES |  |  |
Operating revenue | 4,314 | 11,660 | 7,362
Transportation and gathering |  |  |
OPERATING EXPENSES |  |  |
Operating expenses | $ 496,731 | $ 481,439 | $ 436,542

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