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CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Statement [Abstract]      
Revenues $ 12,632,559 $ 14,805,794 $ 12,678,791
Cost of sales and fuel 10,281,718 12,425,435 10,616,621
Net margin 2,350,841 2,380,359 2,062,170
Operating expenses      
Operations and maintenance 806,087 813,666 740,881
Depreciation and amortization 335,844 312,160 307,224
Goodwill impairment 10,255 0 0
General taxes 102,891 94,657 90,032
Total operating expenses 1,255,077 1,220,483 1,138,137
Gain (loss) on sale of assets 6,736 (963) 18,619
Operating income 1,102,500 1,158,913 942,652
Equity earnings from investments (Note O) 123,024 127,246 101,880
Allowance for equity funds used during construction 13,648 2,335 1,018
Other income 12,504 1,410 11,527
Other expense (4,925) (9,336) (11,067)
Interest expense (net of capitalized interest of $41,776, $23,960 and $4,888, respectively) (302,305) (297,006) (292,232)
Income before income taxes 944,446 983,562 753,778
Income taxes (Note N) (215,195) (226,048) (213,720)
Income from continuing operations 729,251 757,514 540,058
Income from discontinued operations, net of tax (Note B) 762 2,230 1,272
Gain on sale of discontinued operations, net of tax (Note B) 13,517 0 0
Net income 743,530 759,744 541,330
Less: Net income attributable to noncontrolling interests 382,911 399,150 206,698
Net income attributable to ONEOK 360,619 360,594 334,632
Amounts attributable to ONEOK:      
Income from continuing operations 346,340 358,364 333,360
Income from discontinued operations 14,279 2,230 1,272
Net Income $ 360,619 $ 360,594 $ 334,632
Basic earnings per share (Note K):      
Income from continuing operations $ 1.68 $ 1.71 $ 1.57
Income from discontinued operations $ 0.07 $ 0.01 $ 0.00
Net Income $ 1.75 $ 1.72 $ 1.57
Diluted earnings per share (Note K):      
Income from continuing operations $ 1.64 $ 1.67 $ 1.55
Income from discontinued operations $ 0.07 $ 0.01 $ 0.00
Net Income $ 1.71 $ 1.68 $ 1.55
Average shares (thousands)      
Basic 206,140 209,344 212,736
Diluted 210,710 214,498 215,570
Dividends declared per share of common stock $ 1.27 $ 1.08 $ 0.91