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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

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