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Segment Information - Additional Significant Financial Information by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | $ 109,889 | $ 102,185 | $ 96,732
Income tax expense (benefit) | 1,194 | (80,772) | 30,467
Property and Casualty |  |  |
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | 79,073 | 76,967 | 74,950
Retirement |  |  |
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | 23,186 | 17,759 | 14,635
Life |  |  |
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | 7,630 | 7,459 | 7,147
Operating Segments | Property and Casualty |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | (6,622) | (3,279) | 4,627
Operating Segments | Retirement |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | 10,000 | (19,498) | 20,334
Operating Segments | Life |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | 4,979 | (51,876) | 9,775
Corporate and Other | Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | $ (7,163) | $ (6,119) | $ (4,269)

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- Definition Amount of amortization expense (reversal of expense) for deferred policy acquisition costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6480726&loc=d3e6691-158385 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(7)(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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