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Basis of Presentation - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 1,293,982 |
Other comprehensive income (loss) before reclassifications | $ 9,786 | $ 9,912 | 78,419 | $ 167,692
Amounts reclassified from accumulated other comprehensive income (loss) | 2,422 | (2,274) | 1,561 | (5,568)
Other comprehensive income | 12,208 | 7,638 | 79,980 | 162,124
Ending balance | 1,390,441 | 1,444,084 | 1,390,441 | 1,444,084
Other income tax expense (benefit) | (1,304) | 1,225 | (840) | 2,998
Total |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 231,693 | 317,859 | 163,921 | 163,373
Ending balance | 243,901 | 325,497 | 243,901 | 325,497
Net Unrealized Investment Gains and Losses on Fixed Maturity and Equity Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 243,510 | 329,653 | 175,738 | 175,167
Other comprehensive income (loss) before reclassifications | 9,786 | 9,912 | 78,419 | 167,692
Amounts reclassified from accumulated other comprehensive income (loss) | 2,422 | (2,274) | 1,561 | (5,568)
Other comprehensive income | 12,208 | 7,638 | 79,980 | 162,124
Ending balance | 255,718 | 337,291 | 255,718 | 337,291
Pretax reclassification amounts from accumulated other comprehensive income (loss) | (3,726) | 3,499 | (2,401) | 8,566
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=84158357&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=84228862&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=84159872&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=84228862&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=84228862&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=84158357&loc=d3e1436-108581 + Details
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