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Basis of Presentation - Accumulated Other Comprehensive Income (Loss) (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 |
Other comprehensive income (loss) before reclassifications | $ (107,163) | $ 52,873 | (227,466) | $ 162,412
Amounts reclassified from AOCI | (114,925) | 429 | (121,330) | 2,872
Net current period other comprehensive income (loss) | (7,762) | (52,444) | 106,136 | (174,581)
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
Other income tax expense (benefit) | 30,549 | (115) | 32,252 | (764)
Total [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 198,654 | 164,823 | 84,756 | 286,960
Cumulative effect of change in accounting principle | 0 | 0 | 0 | (15,041)
Ending balance | 190,892 | 112,379 | 190,892 | 112,379
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
Other comprehensive income (loss) before reclassifications | (107,163) | 52,873 | (227,466) | 162,412
Amounts reclassified from AOCI | (114,925) | 429 | (121,330) | 2,872
Net current period other comprehensive income (loss) | (7,762) | (52,444) | 106,136 | (174,581)
Cumulative effect of change in accounting principle |  |  |  | (15,041)
Ending balance | 203,077 | 125,596 | 203,077 | 125,596
Pretax reclassification amounts from accumulated other comprehensive income (loss) | 145,474 | (544) | 153,582 | (3,636)
Net Funded Status of Benefit Plans [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (12,185) | (13,217) | (12,185) | (13,217)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | 0 | 0 | 0 | 0
Net current period other comprehensive income (loss) | 0 | 0 | 0 | 0
Cumulative effect of change in accounting principle |  |  |  | 0
Ending balance | $ (12,185) | $ (13,217) | $ (12,185) | $ (13,217)

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- Definition Other Comprehensive Income (Loss), Net Of Tax, Adjusted + References No definition available. + Details
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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=118930883&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=118951672&loc=d3e1436-108581 + Details
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