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Segment Information - Additional Significant Financial Information by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | $ 102,185 | $ 96,732 | $ 98,919
Income tax expense (benefit) | (80,772) | 30,467 | 35,970
Property and Casualty |  |  |
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | 76,967 | 74,950 | 73,173
Retirement |  |  |
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | 17,759 | 14,635 | 18,155
Life |  |  |
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | 7,459 | 7,147 | 7,591
Operating Segments | Property and Casualty |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | (3,279) | 4,627 | 11,274
Operating Segments | Retirement |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | (19,498) | 20,334 | 19,873
Operating Segments | Life |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | (51,876) | 9,775 | 7,951
Corporate and Other | Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | $ (6,119) | $ (4,269) | $ (3,128)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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