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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net income $ 313,916 $ 166,531 $ 862,144 $ 528,707
Other comprehensive income (loss), net of tax        
Unrealized gains (losses) on derivatives, net of tax of $1,054, $12,217, $(3,204) and $8,689, respectively (3,526) (20,620) 10,729 (1,287)
Realized (gains) losses on derivatives recognized in net income, net of tax of $(5,752), $(7,671), $(12,962) and $(13,077), respectively 19,261 13,062 43,397 40,272
Change in pension and postretirement benefit plan liability, net of tax of $(966), $(1,360), $(2,714) and $(4,081), respectively 3,236 2,041 9,086 6,122
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax of $(442), $100, $(1,578) and $288, respectively 1,480 (169) 5,281 (1,214)
Total other comprehensive income (loss), net of tax 20,451 (5,686) 68,493 43,893
Comprehensive income 334,367 160,845 930,637 572,600
Less: Comprehensive income attributable to noncontrolling interests 657 789 3,329 234,937
Comprehensive income attributable to ONEOK $ 333,710 $ 160,056 $ 927,308 $ 337,663