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CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
OPERATING REVENUES |  |  |  |
Operating revenues | $ 548,710 | $ 386,252 | $ 1,473,475 | $ 1,317,363
Gain (loss) on derivative instruments | (3,537) | (836) | (1,628) | 46,353
TOTAL OPERATING REVENUES | 545,173 | 385,416 | 1,471,847 | 1,363,716
OPERATING EXPENSES |  |  |  |
Direct operations | 17,030 | 26,282 | 52,757 | 78,185
Taxes other than income | 2,852 | 9,194 | 15,434 | 26,562
Exploration | 10,049 | 6,466 | 68,166 | 16,623
Depreciation, depletion and amortization | 121,172 | 146,267 | 288,210 | 425,689
Impairment of oil and gas properties | 0 | 0 | 0 | 68,555
General and administrative | 20,724 | 23,244 | 66,013 | 70,902
TOTAL OPERATING EXPENSES | 394,766 | 332,141 | 1,024,865 | 1,058,687
Loss on equity method investments | (11) | (1,417) | (1,009) | (3,986)
Gain (loss) on sale of assets | 25,655 | (11,872) | (14,850) | (13,498)
INCOME FROM OPERATIONS | 176,051 | 39,986 | 431,123 | 287,545
Interest expense, net | 14,191 | 20,331 | 57,577 | 61,720
Other expense (income) | 115 | (5,083) | 347 | (4,974)
Income before income taxes | 161,745 | 24,738 | 373,199 | 230,799
Income tax expense | 39,408 | 7,151 | 91,201 | 85,965
NET INCOME | $ 122,337 | $ 17,587 | $ 281,998 | $ 144,834
Earnings per share |  |  |  |
Basic (in dollars per share) | $ 0.28 | $ 0.04 | $ 0.63 | $ 0.31
Diluted (in dollars per share) | $ 0.28 | $ 0.04 | $ 0.62 | $ 0.31
Weighted-average common shares outstanding |  |  |  |
Basic (in shares) | 440,772 | 462,498 | 450,445 | 464,194
Diluted (in shares) | 443,110 | 464,780 | 452,313 | 466,010
Dividends per common share (in dollars per share) | $ 0.06 | $ 0.05 | $ 0.18 | $ 0.12
Natural gas |  |  |  |
OPERATING REVENUES |  |  |  |
Operating revenues | $ 440,835 | $ 323,319 | $ 1,217,603 | $ 1,152,089
Crude oil and condensate |  |  |  |
OPERATING REVENUES |  |  |  |
Operating revenues | 0 | 56,913 | 48,722 | 144,528
Brokered natural gas |  |  |  |
OPERATING REVENUES |  |  |  |
Operating revenues | 105,849 | 3,528 | 203,375 | 12,260
OPERATING EXPENSES |  |  |  |
Operating expenses | 93,405 | 2,797 | 178,437 | 10,262
Other |  |  |  |
OPERATING REVENUES |  |  |  |
Operating revenues | 2,026 | 2,492 | 3,775 | 8,486
Transportation and gathering |  |  |  |
OPERATING EXPENSES |  |  |  |
Operating expenses | $ 129,534 | $ 117,891 | $ 355,848 | $ 361,909

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