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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Statement of Income and Comprehensive Income [Abstract]        
Net income $ 164,988 $ 160,880 $ 547,655 $ 494,992
Other comprehensive income (loss), net of tax        
Unrealized gains (losses) on energy marketing and risk-management assets/liabilities, net of tax of $12,244, $14,194, $(2,146) and $10,487, respectively (30,383) (37,842) 4,520 (38,004)
Realized (gains) losses in net income, net of tax of $6,143, $10,193, $12,954 and $22,127, respectively (20,973) (15,814) (44,675) (32,522)
Unrealized holding gains (losses) on available-for-sale securities, net of tax of $(57), $31, $(132) and $234, respectively 90 (331) 210 (370)
Change in pension and postretirement benefit plan liability, net of tax of $3,644, $2,947, $10,932 and $8,842, respectively (5,778) (4,672) (17,330) (14,017)
Other, net of tax of $0, $11, $0 and $73, respectively 0 (18) 0 (115)
Total other comprehensive income (loss), net of tax (57,044) (58,677) (57,275) (85,028)
Comprehensive income 107,944 102,203 490,380 409,964
Less: Comprehensive income attributable to noncontrolling interests 77,561 85,189 275,658 230,142
Comprehensive income attributable to ONEOK $ 30,383 $ 17,014 $ 214,722 $ 179,822