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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive income | $ 39,394 | $ 86,424 | $ 57,852 | $ 162,838
Income tax (benefit) | (13,787) | (30,248) | (20,246) | (57,118)
Other comprehensive income, net of tax | 25,607 | 56,176 | 37,606 | 105,720
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Net realized investment (losses) gains | (42) | 836 | (164) | 3,892
Other underwriting and operating expenses, net | (38,511) | (35,348) | (79,276) | (75,125)
Other revenue | 2,502 | 3,994 | 4,924 | 10,367
Income before tax | 180,616 | 165,239 | 354,573 | 268,927
Income tax benefit (expense) | (61,994) | (56,018) | (146,153) | (90,515)
Net income | 118,622 | 109,221 | 208,420 | 178,412
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 2,548,842 |
Other comprehensive income before reclassifications |  |  | 36,510 |
Less: Amounts reclassified from AOCL |  |  | (1,096) |
Balance, end of period | 2,995,061 | 2,515,092 | 2,995,061 | 2,515,092
Reclassification from Accumulated Other Comprehensive Income |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Income before tax | (1,172) | 364 | (1,685) | 2,917
Income tax benefit (expense) | 409 | (127) | 589 | (898)
Net income | (763) | 237 | (1,096) | 2,019
Accumulated other comprehensive loss |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other comprehensive income, net of tax |  |  | 37,606 | 105,720
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | (75,100) | (60,880)
Balance, end of period | (37,494) | 44,840 | (37,494) | 44,840
Net unrealized gains and losses on available-for-sale securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive income | 39,614 | 86,674 | 58,261 | 165,058
Income tax (benefit) | (13,865) | (30,336) | (20,391) | (57,893)
Other comprehensive income, net of tax | 25,749 | 56,338 | 37,870 | 107,165
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | (20,797) |
Other comprehensive income before reclassifications |  |  | 36,479 |
Less: Amounts reclassified from AOCL |  |  | (1,391) |
Balance, end of period | 17,073 |  | 17,073 |
Net unrealized gains and losses on available-for-sale securities | Reclassification from Accumulated Other Comprehensive Income |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Net realized investment (losses) gains | (1,392) | 98 | (2,139) | 710
Income tax benefit (expense) | 487 | (34) | 748 | (126)
Net income | (905) | 64 | (1,391) | 584
Net benefit plan assets and obligations recognized in shareholders' equity |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive income | (220) | (266) | (454) | (740)
Income tax (benefit) | 78 | 93 | 159 | 259
Other comprehensive income, net of tax | (142) | (173) | (295) | (481)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | (54,272) |
Other comprehensive income before reclassifications |  |  | 0 |
Less: Amounts reclassified from AOCL |  |  | 295 |
Balance, end of period | (54,567) |  | (54,567) |
Net benefit plan assets and obligations recognized in shareholders' equity | Reclassification from Accumulated Other Comprehensive Income |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Other underwriting and operating expenses, net | 220 | 266 | 454 | 740
Income tax benefit (expense) | (78) | (93) | (159) | (259)
Net income | 142 | 173 | 295 | 481
Net unrealized foreign currency translation |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive income | 0 | 16 | 45 | (1,480)
Income tax (benefit) | 0 | (5) | (14) | 516
Other comprehensive income, net of tax | 0 | 11 | 31 | (964)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | (31) |
Other comprehensive income before reclassifications |  |  | 31 |
Less: Amounts reclassified from AOCL |  |  | 0 |
Balance, end of period | 0 |  | 0 |
Net unrealized foreign currency translation | Reclassification from Accumulated Other Comprehensive Income |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Other revenue | 0 | 0 | 0 | 1,467
Income tax benefit (expense) | 0 | 0 | 0 | (513)
Net income | $ 0 | $ 0 | $ 0 | $ 954

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