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Investments - Reconciliation of Net Unrealized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 1,501,573 |
Change in net unrealized investment gains on securities | $ (52,444) | $ 45,239 | (159,540) | $ 67,772
Cumulative effect of change in accounting principle | 0 | 0 | (15,041) | 0
Ending balance | 1,350,441 | 1,362,130 | 1,350,441 | 1,362,130
Net Unrealized Investment Gains and Losses on Fixed Maturity and Equity Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 178,040 | 198,271 | 300,177 | 175,738
Cumulative effect of change in accounting principle | 0 |  | (15,041) |
Ending balance | 125,596 | 243,510 | 125,596 | 243,510
Net Unrealized Investment Gains and Losses on Fixed Maturity and Equity Securities | Fixed maturity securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 206,293 | 228,337 | 286,176 | 202,941
Change in net unrealized investment gains on securities | (61,724) | 54,193 | (129,009) | 79,386
Reclassification of net investment (gains) losses to net income | 429 | (1,065) | 2,872 | (862)
Ending balance | $ 144,998 | $ 281,465 | $ 144,998 | $ 281,465

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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