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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Consolidated Statements of Comprehensive Income |  |  |
Net income | $ 186,483 | $ 178,871 | $ 87,554
Unrealized gains (losses) on available for sale securities: |  |  |
Unrealized holding gains (losses) arising during period | 36,211 | (17,322) | (3,486)
Tax effect | (7,966) | 3,843 | 1,329
Reclassification adjustment for (gains) losses included in net income | 2,655 | 655 | (668)
Tax effect | (584) | (145) | 255
Net of tax amount | 30,316 | (12,969) | (2,570)
Unrealized gains (losses) on derivative financial instruments qualifying as cash flow hedges: |  |  |
Unrealized holding gains (losses) arising during period | (13,394) | 42 | (22)
Tax effect | 2,947 | (9) | 9
Reclassification adjustment for gains (losses) included in interest expense | (349) | 155 | 275
Tax effect | 77 | (34) | (105)
Net of tax amount | (10,719) | 154 | 157
Change in pension plan obligation: |  |  |
Change in pension and retiree medical plan obligation during period | 25 | 490 | (589)
Tax effect | (5) | (108) | 224
Reclassification adjustment for changes included in net income | 8,053 | 1,187 | 908
Tax effect | (1,772) | (261) | (346)
Net of tax amount | 6,301 | 1,308 | 197
Other comprehensive income (loss), net of tax | 25,898 | (11,507) | (2,216)
Comprehensive income | $ 212,381 | $ 167,364 | $ 85,338

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