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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net income | $ 292,888 | $ 313,916 | $ 282,179 | $ 266,049 | $ 64,812 | $ 166,531 | $ 175,991 | $ 186,185 | $ 1,155,032 | $ 593,519 | $ 743,499
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on derivatives, net of tax of $1,694, $19,006 and $5,452 respectively |  |  |  |  |  |  |  |  | (5,673) | (21,408) | (30,300)
Realized (gains) losses on derivatives recognized in net income, net of tax of $(11,013), $(26,899) and $230, respectively |  |  |  |  |  |  |  |  | 36,870 | 63,687 | (6,977)
Change in pension and postretirement benefit plan liability, net of tax of $(1,425), $(878) and $11,128, respectively |  |  |  |  |  |  |  |  | 4,771 | (4,175) | (16,693)
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax of $(724), $145 and $270, respectively |  |  |  |  |  |  |  |  | 2,424 | (970) | (1,505)
Total other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 38,392 | 37,134 | (55,475)
Comprehensive income |  |  |  |  |  |  |  |  | 1,193,424 | 630,653 | 688,024
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 3,329 | 236,704 | 363,093
Comprehensive income attributable to ONEOK |  |  |  |  |  |  |  |  | $ 1,190,095 | $ 393,949 | $ 324,931

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