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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Net income $ 309,155 $ 311,963 $ 337,208 $ 313,916 $ 282,179 $ 266,049 $ 958,326 $ 862,144
Other comprehensive income (loss), net of tax                
Change in fair value of derivatives, net of tax of $22,050, $1,054, $59,679 and $(3,204), respectively (73,822)     (3,526)     (199,795) 10,729
Derivative amounts reclassified to net income, net of tax of $2,673, $(5,752), $8,654 and $(12,962), respectively (8,952)     19,261     (29,748) 43,397
Change in retirement and other postretirement benefit plan obligations, net of tax of $(737), $(966), $(2,172) and $(2,714), respectively 2,465     3,236     7,271 9,086
Other comprehensive income (loss) of unconsolidated affiliates, net of tax of $1,314, $(442), $3,164 and $(1,578), respectively (4,399)     1,480     (10,593) 5,281
Total other comprehensive income (loss), net of tax (84,708) $ (66,872) $ (81,285) 20,451 $ (3,897) $ 51,939 (232,865) 68,493
Comprehensive income 224,447     334,367     725,461 930,637
Less: Comprehensive income attributable to noncontrolling interests 0     657     0 3,329
Comprehensive income attributable to ONEOK $ 224,447     $ 333,710     $ 725,461 $ 927,308