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Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 323,752 | $ 225,482 | $ 210,386
Unrealized gains (losses) on securities: |  |  |
Change in unrealized securities gains (losses) arising during period | 28,166 | (21,530) | (22,030)
Tax effect | (10,531) | 7,584 | 8,486
Reclassification adjustment for net gains realized and included in income before income taxes | (4,293) | (26,673) | (10,817)
Tax effect | 1,588 | 9,869 | 4,138
Total change in unrealized gains (losses) on securities, net of tax | 14,930 | (30,750) | (20,223)
Change in fair value of cash flow hedges: |  |  |
Change in unrecognized loss on cash flow hedges | 0 | 1,429 | 2,908
Tax effect | 0 | (537) | (1,136)
Total change in unrecognized loss on cash flow hedges, net of tax | 0 | 892 | 1,772
Change in pension obligation: |  |  |
Change in pension obligation | (12,945) | (70,424) | 691
Tax effect | 4,789 | 25,077 | (297)
Amortization of actuarial losses and prior service cost | 9,720 | 7,069 | 11,586
Tax effect | (3,596) | (2,616) | (4,988)
Total change in pension obligation, net of tax | (2,032) | (40,894) | 6,992
Net current period other comprehensive income (loss) | 12,898 | (70,752) | (11,459)
Total comprehensive income | $ 336,650 | $ 154,730 | $ 198,927

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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