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Investments - Reconciliation of Net Unrealized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 1,290,550 |
Change in net unrealized investment gains (losses) on securities | $ (7,762) | $ (52,444) | 106,136 | $ (159,540)
Cumulative effect of change in accounting principle | 0 | 0 | 0 | (15,041)
Ending balance | 1,499,677 | 1,350,441 | 1,499,677 | 1,350,441
Net Unrealized Investment Gains (Losses) on Securities [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 210,839 | 178,040 | 96,941 | 300,177
Cumulative effect of change in accounting principle |  |  |  | (15,041)
Ending balance | 203,077 | 125,596 | 203,077 | 125,596
Net Unrealized Investment Gains (Losses) on Securities [Member] | Fixed maturity securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 245,319 | 206,293 | 111,712 | 286,176
Change in net unrealized investment gains (losses) on securities | 100,693 | (61,724) | 240,705 | (129,009)
Reclassification of net investment (gains) losses on securities to net income | (114,925) | 429 | (121,330) | 2,872
Ending balance | $ 231,087 | $ 144,998 | $ 231,087 | $ 144,998

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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 and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
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