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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenues |  |  |  |
Commodity sales | $ 2,675,262 | $ 2,161,009 | $ 5,495,266 | $ 4,377,726
Services | 285,267 | 564,763 | 567,340 | 1,097,657
Total revenues | 2,960,529 | 2,725,772 | 6,062,606 | 5,475,383
Cost of sales and fuel (exclusive of items shown separately below) | 2,175,818 | 2,091,022 | 4,543,844 | 4,234,865
Operations and maintenance | 202,037 | 190,784 | 383,218 | 352,836
Depreciation and amortization | 106,288 | 100,849 | 210,525 | 200,268
General taxes | 28,116 | 24,304 | 57,139 | 51,457
Gain on sale of assets | (96) | (637) | (185) | (630)
Operating income | 448,366 | 319,450 | 868,065 | 636,587
Equity in net earnings from investments (Note I) | 36,570 | 39,363 | 76,757 | 78,927
Allowance for equity funds used during construction | 804 | 22 | 1,034 | 35
Other income | 1,857 | 4,033 | 2,595 | 8,374
Other expense | (4,391) | (24,560) | (7,700) | (28,027)
Interest expense (net of capitalized interest of $5,134, $1,745, $7,172, and $3,186, respectively) | (113,496) | (118,473) | (229,221) | (234,935)
Income before income taxes | 369,710 | 219,835 | 711,530 | 460,961
Income taxes | (87,531) | (43,844) | (163,302) | (98,785)
Net income | 282,179 | 175,991 | 548,228 | 362,176
Less: Net income attributable to noncontrolling interests | 1,131 | 104,298 | 2,672 | 203,122
Net income attributable to ONEOK | 281,048 | 71,693 | 545,556 | 159,054
Less: Preferred stock dividends | 275 | 217 | 550 | 217
Net income available to common shareholders | $ 280,773 | $ 71,476 | $ 545,006 | $ 158,837
Basic earnings per common share | $ 0.68 | $ 0.34 | $ 1.33 | $ 0.75
Diluted earnings per common share | $ 0.68 | $ 0.33 | $ 1.32 | $ 0.74
Average shares (thousands) |  |  |  |
Basic | 411,946 | 211,785 | 410,811 | 211,702
Diluted | 414,641 | 214,012 | 413,407 | 213,807
Dividends declared per share of common stock | $ 0.795 | $ 0.615 | $ 1.565 | $ 1.230

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration