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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues |  |  |
Commodity sales | $ 11,395,642 | $ 9,862,652 | $ 6,858,456
Services | 1,197,554 | 2,311,255 | 2,062,478
Total revenues | 12,593,196 | 12,173,907 | 8,920,934
Cost of sales and fuel (exclusive of items shown separately below) | 9,422,708 | 9,538,045 | 6,496,124
Operations and maintenance | 803,146 | 724,314 | 658,233
Depreciation and amortization | 428,557 | 406,335 | 391,585
Impairment of long-lived assets (Note D) | 0 | 15,970 | 0
General taxes | 103,922 | 98,396 | 88,849
Gain on sale of assets | (601) | (924) | (9,635)
Operating income | 1,835,464 | 1,391,771 | 1,295,778
Equity in net earnings from investments (Note M) | 158,383 | 159,278 | 139,690
Impairment of equity investments (Note M) | 0 | (4,270) | 0
Allowance for equity funds used during construction | 7,962 | 107 | 209
Other income | 674 | 15,385 | 6,091
Other expense | (14,928) | (35,812) | (14,161)
Interest expense (net of capitalized interest of $28,062, $5,510 and $10,591, respectively) | (469,620) | (485,658) | (469,651)
Income before income taxes | 1,517,935 | 1,040,801 | 957,956
Income taxes (Note L) | (362,903) | (447,282) | (212,406)
Income from continuing operations | 1,155,032 | 593,519 | 745,550
Income (loss) from discontinued operations, net of tax | 0 | 0 | (2,051)
Net income | 1,155,032 | 593,519 | 743,499
Less: Net income attributable to noncontrolling interests | 3,329 | 205,678 | 391,460
Net income attributable to ONEOK | 1,151,703 | 387,841 | 352,039
Less: Preferred stock dividends | 1,100 | 767 | 0
Net income available to common shareholders | 1,150,603 | 387,074 | 352,039
Amounts available to common shareholders: |  |  |
Income from continuing operations | 1,150,603 | 387,074 | 354,090
Income (loss) from discontinued operations | 0 | 0 | (2,051)
Net income available to common shareholders | $ 1,150,603 | $ 387,074 | $ 352,039
Basic earnings per common share: |  |  |
Income from continuing operations (Note I) | $ 2.80 | $ 1.30 | $ 1.68
Income (loss) from discontinued operations | 0.00 | 0.00 | (0.01)
Net income | 2.80 | 1.30 | 1.67
Diluted earnings per common share: |  |  |
Income from continuing operations (Note I) | 2.78 | 1.29 | 1.67
Income (loss) from discontinued operations | 0.00 | 0.00 | (0.01)
Net income | $ 2.78 | $ 1.29 | $ 1.66
Average shares (thousands) |  |  |
Basic | 411,485 | 297,477 | 211,128
Diluted | 414,195 | 299,780 | 212,383

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