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Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Components of Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net unrealized investment (losses) gains arising during the year |  |  |  |  |  |  |  |  | $ (5,425) | $ (33,718) | $ 91,782
Income tax benefit (expense) |  |  |  |  |  |  |  |  | 1,776 | 11,738 | (32,017)
Valuation allowance |  |  |  |  |  |  |  |  | 0 | 62,383 | 31,374
Net of taxes |  |  |  |  |  |  |  |  | (3,649) | 40,403 | 91,139
Net changes in benefit plan assets and obligations |  |  |  |  |  |  |  |  | (14,799) | (12,818) | (52,112)
Income tax benefit |  |  |  |  |  |  |  |  | 5,179 | 4,487 | 18,239
Valuation allowance |  |  |  |  |  |  |  |  | 0 | (7,383) | (18,239)
Net of taxes |  |  |  |  |  |  |  |  | (9,620) | (15,714) | (52,112)
Net changes in unrealized foreign currency translation adjustment |  |  |  |  |  |  |  |  | (1,463) | (5,699) | (4,067)
Income tax benefit |  |  |  |  |  |  |  |  | 512 | 2,000 | 1,425
Valuation allowance |  |  |  |  |  |  |  |  | 0 | (529) | 0
Net of taxes |  |  |  |  |  |  |  |  | (951) | (4,228) | (2,642)
Total other comprehensive (loss) income |  |  |  |  |  |  |  |  | (21,687) | (52,235) | 35,603
Total income tax benefit, net of valuation allowance |  |  |  |  |  |  |  |  | 7,467 | 72,696 | 782
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  | (14,220) | 20,461 | 36,385
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 514,714 | 487,687 | 254,723
Total income tax expense, net of valuation allowance | $ (54,551) | $ (27,131) | $ (56,018) | $ (34,497) | $ (6,584) | $ 695,604 | $ (1,322) | $ (3,385) | (172,197) | 684,313 | (2,774)
Valuation allowance |  |  |  |  |  |  |  |  | 0 | 161,158 | 88,833
Net income | 107,487 | $ 56,618 | $ 109,221 | 69,191 | 102,418 | $ 822,852 | $ 113,654 | 133,076 | 342,517 | 1,172,000 | 251,949
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 2,236,140 |  |  |  | 1,036,903 | 2,236,140 | 1,036,903 |
Balance, end of year | 2,548,842 |  |  |  | 2,236,140 |  |  |  | 2,548,842 | 2,236,140 | 1,036,903
Accumulated other comprehensive loss |  |  |  |  |  |  |  |  |  |  |
Components of Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  | (14,220) | 20,461 | 36,385
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | (60,880) |  |  |  | (81,341) | (60,880) | (81,341) | (117,726)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | (8,147) | 33,707 | 36,399
Less: Amounts reclassified from AOCL |  |  |  |  |  |  |  |  | 6,073 | 13,246 | 14
Balance, end of year | (75,100) |  |  |  | (60,880) |  |  |  | (75,100) | (60,880) | (81,341)
Net unrealized gains and losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | (17,148) |  |  |  | (57,551) | (17,148) | (57,551) | (148,690)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | 508 | 51,655 | 84,223
Less: Amounts reclassified from AOCL |  |  |  |  |  |  |  |  | 4,157 | 11,252 | (6,916)
Balance, end of year | (20,797) |  |  |  | (17,148) |  |  |  | (20,797) | (17,148) | (57,551)
Net benefit plan assets and obligations recognized in shareholders' equity |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | (44,652) |  |  |  | (28,938) | (44,652) | (28,938) | 23,174
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | (8,658) | (13,720) | (45,182)
Less: Amounts reclassified from AOCL |  |  |  |  |  |  |  |  | 962 | 1,994 | 6,930
Balance, end of year | (54,272) |  |  |  | (44,652) |  |  |  | (54,272) | (44,652) | (28,938)
Net unrealized foreign currency translation |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | $ 920 |  |  |  | $ 5,148 | 920 | 5,148 | 7,790
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | 3 | (4,228) | (2,642)
Less: Amounts reclassified from AOCL |  |  |  |  |  |  |  |  | 954 | 0 | 0
Balance, end of year | $ (31) |  |  |  | $ 920 |  |  |  | (31) | 920 | 5,148
Reclassification from Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 9,154 | 13,877 | 114
Total income tax expense, net of valuation allowance |  |  |  |  |  |  |  |  | (3,081) | (631) | (100)
Net income |  |  |  |  |  |  |  |  | 6,073 | 13,246 | 14
Reclassification from Accumulated Other Comprehensive Income | Net unrealized gains and losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 6,207 | 11,693 | (6,816)
Total income tax expense, net of valuation allowance |  |  |  |  |  |  |  |  | (2,050) | (4,076) | 2,402
Valuation allowance |  |  |  |  |  |  |  |  | 0 | 3,635 | (2,502)
Net income |  |  |  |  |  |  |  |  | 4,157 | 11,252 | (6,916)
Reclassification from Accumulated Other Comprehensive Income | Net benefit plan assets and obligations recognized in shareholders' equity |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 1,480 | 2,184 | 6,930
Total income tax expense, net of valuation allowance |  |  |  |  |  |  |  |  | (518) | (764) | (2,425)
Valuation allowance |  |  |  |  |  |  |  |  | 0 | 574 | 2,425
Net income |  |  |  |  |  |  |  |  | 962 | 1,994 | 6,930
Reclassification from Accumulated Other Comprehensive Income | Net unrealized foreign currency translation |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 1,467 | 0 | 0
Total income tax expense, net of valuation allowance |  |  |  |  |  |  |  |  | (513) | 0 | 0
Net income |  |  |  |  |  |  |  |  | $ 954 | $ 0 | $ 0

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