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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenues |  |  |  |
Commodity sales | $ 3,083,625 | $ 2,322,534 | $ 8,578,891 | $ 6,700,260
Services | 310,265 | 583,832 | 877,605 | 1,681,489
Total revenues | 3,393,890 | 2,906,366 | 9,456,496 | 8,381,749
Cost of sales and fuel (exclusive of items shown separately below) | 2,560,765 | 2,229,416 | 7,104,609 | 6,464,281
Operations and maintenance | 206,247 | 179,693 | 589,465 | 532,529
Depreciation and amortization | 107,383 | 102,298 | 317,908 | 302,566
Impairment of long-lived assets | 0 | 15,970 | 0 | 15,970
General taxes | 24,124 | 24,641 | 81,263 | 76,098
Gain on sale of assets | (163) | (274) | (348) | (904)
Operating income | 495,534 | 354,622 | 1,363,599 | 991,209
Equity in net earnings from investments (Note I) | 39,313 | 40,058 | 116,070 | 118,985
Impairment of equity investments (Note I) | 0 | (4,270) | 0 | (4,270)
Allowance for equity funds used during construction | 2,294 | 40 | 3,328 | 75
Other income | 5,072 | 3,296 | 7,667 | 11,670
Other expense | (3,404) | (3,554) | (11,104) | (31,581)
Interest expense (net of capitalized interest of $8,326, $1,068, $15,498, and $4,254, respectively) | (121,910) | (126,533) | (351,131) | (361,468)
Income before income taxes | 416,899 | 263,659 | 1,128,429 | 724,620
Income taxes | (102,983) | (97,128) | (266,285) | (195,913)
Net income | 313,916 | 166,531 | 862,144 | 528,707
Less: Net income attributable to noncontrolling interests | 657 | 789 | 3,329 | 203,911
Net income attributable to ONEOK | 313,259 | 165,742 | 858,815 | 324,796
Less: Preferred stock dividends | 275 | 276 | 825 | 493
Net income available to common shareholders | $ 312,984 | $ 165,466 | $ 857,990 | $ 324,303
Basic earnings per common share | $ 0.76 | $ 0.43 | $ 2.09 | $ 1.21
Diluted earnings per common share | $ 0.75 | $ 0.43 | $ 2.07 | $ 1.20
Average shares (thousands) |  |  |  |
Basic | 412,117 | 380,907 | 411,400 | 268,108
Diluted | 414,847 | 383,419 | 414,035 | 270,349
Dividends declared per share of common stock | $ 0.825 | $ 0.745 | $ 2.390 | $ 1.975

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