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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Consolidated Statements of Comprehensive Income [Abstract] |  |  |
Net income | $ 215,632 | $ 149,296 | $ 131,461
Other comprehensive income (loss) before income taxes: |  |  |
Net change in unrealized loss on available for sale securities and hedges | (425) | (57,346) | (21,270)
Reclassification of net losses realized and included in earnings | 5,801 | 4,016 | 3,010
Valuation adjustment for pension plan amendment | 17,315 |  |
Other valuation adjustments for employee benefit plans | (10,929) | (12,748) | (33,971)
Amortization of unrealized net loss on securities transferred to held to maturity | 3,786 | 3,830 | 3,530
Other comprehensive income (loss) before income taxes | 15,548 | (62,248) | (48,701)
Income tax expense (benefit) | 4,088 | (22,311) | (18,180)
Other comprehensive (income) loss net of income taxes | 11,460 | (39,937) | (30,521)
Comprehensive income | $ 227,092 | $ 109,359 | $ 100,940

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