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Basis of Presentation - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 1,501,573 |
Other comprehensive income (loss) before reclassifications | (109,539) | $ 22,330
Amounts reclassified from accumulated other comprehensive income (loss) | 2,443 | 203
Cumulative effect of change in accounting principle (3) | (15,041) | 0
Other comprehensive income (loss) | (122,137) | 22,533
Ending balance | 1,404,679 | 1,321,818
Other income tax expense (benefit) | (649) | (110)
Reclassification of unrealized gains on equity securities, net of tax | 15,041 | 0
Total |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 286,960 | 163,921
Cumulative effect of change in accounting principle (3) | (15,041) | 0
Ending balance | 164,823 | 186,454
Net Unrealized Investment Gains and Losses on Fixed Maturity and Equity Securities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 300,177 | 175,738
Other comprehensive income (loss) before reclassifications | (109,539) | 22,330
Amounts reclassified from accumulated other comprehensive income (loss) | 2,443 | 203
Cumulative effect of change in accounting principle (3) | (15,041) |
Other comprehensive income (loss) | (122,137) | 22,533
Ending balance | 178,040 | 198,271
Pretax reclassification amounts from accumulated other comprehensive income (loss) | (3,092) | (313)
Benefit Plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (13,217) | (11,817)
Other comprehensive income (loss) before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0
Cumulative effect of change in accounting principle (3) | 0 |
Other comprehensive income (loss) | 0 | 0
Ending balance | $ (13,217) | $ (11,817)

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- Definition Other Comprehensive (Income) Loss, Reclassification Adjustment From AOCI For New Accounting Pronouncements, Net Of Tax + 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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