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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive (loss) income | $ (14,730) | $ 17,535 | $ (107,759) | $ 75,387
Income tax benefit (expense) | 3,093 | (6,138) | 22,629 | (26,384)
Other comprehensive (loss) income, net of tax | (11,637) | 11,397 | (85,130) | 49,003
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Net realized investment gains (losses) | 1,114 | (50) | (1,112) | (227)
Other underwriting and operating expenses, net | (43,655) | (39,888) | (131,587) | (119,164)
Income before tax | 231,894 | 184,467 | 649,441 | 539,040
Income tax benefit (expense) | (49,994) | (64,440) | (137,090) | (210,593)
Net income | 181,900 | 120,027 | 512,351 | 328,447
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 3,154,526 |
Other comprehensive income before reclassifications |  |  | (91,413) |
Less: Amounts reclassified from AOCL |  |  | (6,283) |
Balance, end of period | 3,489,531 | 3,130,149 | 3,489,531 | 3,130,149
Reclassification from Accumulated Other Comprehensive Income |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Income before tax | (3,125) | (201) | (7,953) | (1,886)
Income tax benefit (expense) | 657 | 71 | 1,670 | 660
Net income | (2,468) | (130) | (6,283) | (1,226)
Accumulated other comprehensive (loss) income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other comprehensive (loss) income, net of tax |  |  | (85,130) | 49,003
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | (43,801) | (75,100)
Balance, end of period | (128,931) | (26,097) | (128,931) | (26,097)
Net unrealized gains and losses on available-for-sale securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive (loss) income | (15,288) | 17,761 | (109,433) | 76,022
Income tax benefit (expense) | 3,211 | (6,217) | 22,981 | (26,608)
Other comprehensive (loss) income, net of tax | (12,077) | 11,544 | (86,452) | 49,414
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 29,257 |
Other comprehensive income before reclassifications |  |  | (91,413) |
Less: Amounts reclassified from AOCL |  |  | (4,961) |
Balance, end of period | (57,195) |  | (57,195) |
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 gains (losses) | (2,567) | (427) | (6,279) | (2,566)
Income tax benefit (expense) | 539 | 150 | 1,318 | 898
Net income | (2,028) | (277) | (4,961) | (1,668)
Net benefit plan assets and obligations recognized in shareholders' equity |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive (loss) income | 558 | (226) | 1,674 | (680)
Income tax benefit (expense) | (118) | 79 | (352) | 238
Other comprehensive (loss) income, net of tax | 440 | (147) | 1,322 | (442)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | (73,058) |
Other comprehensive income before reclassifications |  |  | 0 |
Less: Amounts reclassified from AOCL |  |  | (1,322) |
Balance, end of period | (71,736) |  | (71,736) |
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 | (558) | 226 | (1,674) | 680
Income tax benefit (expense) | 118 | (79) | 352 | (238)
Net income | (440) | 147 | (1,322) | 442
Net unrealized foreign currency translation |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive (loss) income | 0 | 0 | 0 | 45
Income tax benefit (expense) | 0 | 0 | 0 | (14)
Other comprehensive (loss) income, net of tax | $ 0 | $ 0 | $ 0 | $ 31

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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