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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net income $ 282,179 $ 175,991 $ 548,228 $ 362,176
Other comprehensive income (loss), net of tax        
Unrealized gains (losses) on derivatives, net of tax of $6,054, $874, $(4,258) and $(3,527), respectively (20,269) (5,123) 14,255 19,333
Realized (gains) losses on derivatives recognized in net income, net of tax of $(3,631), $(2,041), $(7,209) and $(5,406), respectively 12,160 9,927 24,136 27,210
Change in pension and postretirement benefit plan liability, net of tax of $(967), $(1,361), $(1,748) and $(2,721), respectively 3,235 2,040 5,850 4,081
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax of $(292), $246, $(1,136) and $188, respectively 977 (1,370) 3,801 (1,045)
Total other comprehensive income (loss), net of tax (3,897) 5,474 48,042 49,579
Comprehensive income 278,282 181,465 596,270 411,755
Less: Comprehensive income attributable to noncontrolling interests 1,131 106,507 2,672 234,148
Comprehensive income attributable to ONEOK $ 277,151 $ 74,958 $ 593,598 $ 177,607