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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income $ 612,809 $ 1,278,577 $ 1,155,032
Other comprehensive income (loss), net of tax      
Change in fair value of derivatives, net of tax of $49,292, $44,149 and $1,694, respectively (165,023) (147,803) (5,673)
Derivative amounts reclassified to net income, net of tax of $(6,313), $6,058 and $(11,013), respectively 21,097 (21,057) 36,870
Change in retirement and other postretirement benefit plan obligations, net of tax of $7,812, $2,910 and $(1,425), respectively (26,154) (9,696) 4,771
Other comprehensive income (loss) of unconsolidated affiliates, net of tax of $2,201, $2,152 and $(724), respectively (7,369) (7,205) 2,424
Total other comprehensive income (loss), net of tax (177,449) (185,761) 38,392
Comprehensive income 435,360 1,092,816 1,193,424
Less: Comprehensive income attributable to noncontrolling interests 0 0 3,329
Comprehensive income attributable to ONEOK $ 435,360 $ 1,092,816 $ 1,190,095