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Basis of Presentation - Accumulated Other Comprehensive Income (Loss) (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 |
Other comprehensive income (loss) before reclassifications | $ (52,873) | $ 46,303 | (162,412) | $ 68,633
Amounts reclassified from accumulated other comprehensive income (loss) | 429 | (1,064) | 2,872 | (861)
Cumulative effect of change in accounting principle (3) | 0 | 0 | (15,041) | 0
Other comprehensive income (loss) | (52,444) | 45,239 | (174,581) | 67,772
Ending balance | 1,350,441 | 1,362,130 | 1,350,441 | 1,362,130
Other income tax expense (benefit) | (115) | 574 | (764) | 464
Reclassification of unrealized gains on equity securities, net of tax | 0 | 0 | 15,041 | 0
Total |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 164,823 | 186,454 | 286,960 | 163,921
Cumulative effect of change in accounting principle (3) |  |  | (15,041) | 0
Ending balance | 112,379 | 231,693 | 112,379 | 231,693
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
Other comprehensive income (loss) before reclassifications | (52,873) | 46,303 | (162,412) | 68,633
Amounts reclassified from accumulated other comprehensive income (loss) | 429 | (1,064) | 2,872 | (861)
Cumulative effect of change in accounting principle (3) | 0 |  | (15,041) |
Other comprehensive income (loss) | (52,444) | 45,239 | (174,581) | 67,772
Ending balance | 125,596 | 243,510 | 125,596 | 243,510
Pretax reclassification amounts from accumulated other comprehensive income (loss) | (544) | 1,638 | (3,636) | 1,325
Benefit Plans |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (13,217) | (11,817) | (13,217) | (11,817)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | 0
Cumulative effect of change in accounting principle (3) | 0 |  | 0 |
Other comprehensive income (loss) | 0 | 0 | 0 | 0
Ending balance | $ (13,217) | $ (11,817) | $ (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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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