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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenues |  |  |  |
Revenues | $ 2,263,228 | $ 3,393,890 | $ 7,500,761 | $ 9,456,496
Cost of sales and fuel (exclusive of items shown separately below) | 1,414,528 | 2,560,765 | 4,996,699 | 7,104,609
Operations and maintenance | 218,305 | 206,247 | 632,332 | 589,465
Depreciation and amortization | 121,430 | 107,383 | 350,552 | 317,908
General taxes | 26,830 | 24,124 | 91,257 | 81,263
(Gain) loss on sale of assets | (16) | (163) | 2,882 | (348)
Operating income | 482,151 | 495,534 | 1,427,039 | 1,363,599
Equity in net earnings from investments (Note I) | 37,576 | 39,313 | 115,175 | 116,070
Allowance for equity funds used during construction | 15,792 | 2,294 | 45,175 | 3,328
Other income | 6,643 | 5,072 | 21,685 | 7,667
Other expense | (6,065) | (3,404) | (14,024) | (11,104)
Interest expense (net of capitalized interest of $27,610, $8,326, $73,601 and $15,498, respectively) | (129,577) | (121,910) | (362,490) | (351,131)
Income before income taxes | 406,520 | 416,899 | 1,232,560 | 1,128,429
Income taxes | (97,365) | (102,983) | (274,234) | (266,285)
Net income | 309,155 | 313,916 | 958,326 | 862,144
Less: Net income attributable to noncontrolling interests | 0 | 657 | 0 | 3,329
Net income attributable to ONEOK | 309,155 | 313,259 | 958,326 | 858,815
Less: Preferred stock dividends | 275 | 275 | 825 | 825
Net income available to common shareholders | $ 308,880 | $ 312,984 | $ 957,501 | $ 857,990
Basic earnings per common share (Note G) | $ 0.75 | $ 0.76 | $ 2.32 | $ 2.09
Diluted earnings per common share (Note G) | $ 0.74 | $ 0.75 | $ 2.31 | $ 2.07
Average shares (thousands) |  |  |  |
Basic | 413,816 | 412,117 | 413,443 | 411,400
Diluted | 415,578 | 414,847 | 415,277 | 414,035
Commodity Sales |  |  |  |
Revenues |  |  |  |
Revenues | $ 1,947,834 | $ 3,083,625 | $ 6,567,634 | $ 8,578,891
Services |  |  |  |
Revenues |  |  |  |
Revenues | $ 315,394 | $ 310,265 | $ 933,127 | $ 877,605

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