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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Components of Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Net unrealized holding (losses) gains arising during the period | $ (22,206) | $ 27,271 | $ 142,852 | $ (17,126)
Income tax benefit (expense) | 7,772 | (9,531) | (50,121) | 5,955
Valuation allowance | 0 | 77,555 | 0 | 62,383
Net of taxes | (14,434) | 95,295 | 92,731 | 51,212
Net changes in benefit plan assets and obligations | (370) | (546) | (1,110) | (1,638)
Income tax benefit | 129 | 192 | 388 | 574
Valuation allowance | 0 | (7,001) | 0 | (7,383)
Net of taxes | (241) | (7,355) | (722) | (8,447)
Net changes in unrealized foreign currency translation adjustment | (16) | (3,724) | (1,496) | (6,228)
Income tax benefit | 6 | 1,306 | 522 | 2,186
Valuation allowance | 0 | (529) | 0 | (529)
Net of taxes | (10) | (2,947) | (974) | (4,571)
Total other comprehensive (loss) income | (22,592) | 23,001 | 140,246 | (24,992)
Total income tax benefit (expense), net of valuation allowance | 7,907 | 61,992 | (49,211) | 63,186
Other comprehensive (loss) income, net of tax | (14,685) | 84,993 | 91,035 | 38,194
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Reclassification adjustment | 83,749 | 127,248 | 352,676 | 378,685
Total income tax expense, net of valuation allowance | (27,131) | 695,604 | (117,646) | 690,897
Valuation allowance | 0 | 739,298 | 0 | 822,465
Net income | 56,618 | 822,852 | 235,030 | 1,069,582
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 2,236,140 |
Balance, end of period | 2,583,079 | 2,148,519 | 2,583,079 | 2,148,519
Accumulated other comprehensive income (loss) |  |  |  |
Components of Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Other comprehensive (loss) income, net of tax |  |  | 91,035 | 38,194
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | (60,880) | (81,341)
Other comprehensive income (loss) before reclassifications |  |  | 96,706 |
Less: Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 5,671 |
Balance, end of period | 30,155 | (43,147) | 30,155 | (43,147)
Net unrealized gains and losses on available-for-sale securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | (17,148) |
Other comprehensive income (loss) before reclassifications |  |  | 96,726 |
Less: Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 3,995 |
Balance, end of period | 75,583 |  | 75,583 |
Net benefit plan assets and obligations recognized in shareholders' equity |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | (44,652) |
Other comprehensive income (loss) before reclassifications |  |  | 0 |
Less: Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 722 |
Balance, end of period | (45,374) |  | (45,374) |
Net unrealized foreign currency translation |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 920 |
Other comprehensive income (loss) before reclassifications |  |  | (20) |
Less: Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 954 |
Balance, end of period | (54) |  | (54) |
Reclassification from Accumulated Other Comprehensive Income |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Reclassification adjustment | 5,618 | (574) | 8,535 | 12,229
Total income tax expense, net of valuation allowance | (1,966) | (18) | (2,864) | (62)
Net income | 3,652 | (592) | 5,671 | 12,167
Reclassification from Accumulated Other Comprehensive Income | Net unrealized gains and losses on available-for-sale securities |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Reclassification adjustment | 5,248 | (1,120) | 5,958 | 10,591
Total income tax expense, net of valuation allowance | (1,837) | 395 | (1,963) | (3,697)
Valuation allowance | 0 | (413) | 0 | 3,635
Net income | 3,411 | (1,138) | 3,995 | 10,529
Reclassification from Accumulated Other Comprehensive Income | Net benefit plan assets and obligations recognized in shareholders' equity |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Reclassification adjustment | 370 | 546 | 1,110 | 1,638
Total income tax expense, net of valuation allowance | (129) | (192) | (388) | (574)
Valuation allowance | 0 | 192 | 0 | 574
Net income | 241 | 546 | 722 | 1,638
Reclassification from Accumulated Other Comprehensive Income | Net unrealized foreign currency translation |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Reclassification adjustment | 0 | 0 | 1,467 | 0
Total income tax expense, net of valuation allowance | 0 | 0 | (513) | 0
Net income | $ 0 | $ 0 | $ 954 | $ 0

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