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Basis of Presentation - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 1,293,982 |
Other comprehensive income (loss) before reclassifications | $ 46,303 | $ 87,809 | 68,633 | $ 157,780
Amounts reclassified from accumulated other comprehensive income (loss) | (1,064) | (2,813) | (861) | (3,294)
Other comprehensive income | 45,239 | 84,996 | 67,772 | 154,486
Ending balance | 1,362,130 | 1,417,335 | 1,362,130 | 1,417,335
Other income tax expense (benefit) | 574 | 1,514 | 464 | 1,773
Total |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 186,454 | 232,863 | 163,921 | 163,373
Ending balance | 231,693 | 317,859 | 231,693 | 317,859
Net Unrealized Investment Gains and Losses on Fixed Maturity and Equity Securities (1)(2) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 198,271 | 244,657 | 175,738 | 175,167
Other comprehensive income (loss) before reclassifications | 46,303 | 87,809 | 68,633 | 157,780
Amounts reclassified from accumulated other comprehensive income (loss) | (1,064) | (2,813) | (861) | (3,294)
Other comprehensive income | 45,239 | 84,996 | 67,772 | 154,486
Ending balance | 243,510 | 329,653 | 243,510 | 329,653
Pretax reclassification amounts from accumulated other comprehensive income (loss) | 1,638 | 4,327 | 1,325 | 5,067
Benefit Plans |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (11,817) | (11,794) | (11,817) | (11,794)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | 0
Other comprehensive income | 0 | 0 | 0 | 0
Ending balance | $ (11,817) | $ (11,794) | $ (11,817) | $ (11,794)

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 + Details
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