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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Other comprehensive income (loss): |  |  |  |
Other comprehensive (loss) income | $ (89,048) | $ (159,010) | $ (62,011) | $ (556,416)
Other comprehensive income (loss): |  |  |  |
Other comprehensive income, tax effect | 12,800 | 22,000 | 8,418 | 82,132
Net of Tax |  |  |  |
Balance, beginning of period |  |  | 4,462,309 |
Other comprehensive income (loss): |  |  |  |
Total other comprehensive income loss | (76,248) | (137,010) | (53,593) | (474,284)
Balance, end of period | 4,808,007 | 4,294,208 | 4,808,007 | 4,294,208
Accumulated Other Comprehensive Loss |  |  |  |
Before Tax |  |  |  |
AOCI before tax, beginning of period | (416,193) | (332,126) | (443,230) | 65,280
Other comprehensive income (loss): |  |  |  |
AOCI before tax, end of period | (505,241) | (491,136) | (505,241) | (491,136)
Tax Effect |  |  |  |
AOCI tax effect, beginning of period | 56,058 | 45,559 | 60,440 | (14,573)
Other comprehensive income (loss): |  |  |  |
AOCI tax effect, end of period | 68,858 | 67,559 | 68,858 | 67,559
Net of Tax |  |  |  |
Balance, beginning of period | (360,135) | (286,567) | (382,790) | 50,707
Other comprehensive income (loss): |  |  |  |
Total other comprehensive income loss | (76,248) | (137,010) | (53,593) | (474,284)
Balance, end of period | (436,383) | (423,577) | (436,383) | (423,577)
Accumulated Net Investment Gains (Losses) On Investments |  |  |  |
Other comprehensive income (loss): |  |  |  |
Unrealized holding gains (losses) arising during the period, before tax | (89,283) | (158,835) | (64,323) | (564,064)
Less: Reclassification adjustment for (gains) losses included in net income, before tax | 235 | (175) | 2,312 | 7,648
Other comprehensive (loss) income | (89,048) | (159,010) | (62,011) | (556,416)
Other comprehensive income (loss): |  |  |  |
Unrealized holding gains (losses) arising during the period, tax effect | 12,851 | 21,899 | 8,760 | 81,051
Less: Reclassification adjustment for losses (gains) included in net income, tax effect | (51) | 101 | (342) | 1,081
Other comprehensive income, tax effect | 12,800 | 22,000 | 8,418 | 82,132
Other comprehensive income (loss): |  |  |  |
Unrealized holding gains (losses) arising during the period, net of tax | (76,432) | (136,936) | (55,563) | (483,013)
Less: Reclassification adjustment for losses (gains) included in net income, net of tax | 184 | (74) | 1,970 | 8,729
Total other comprehensive income loss | $ (76,248) | $ (137,010) | $ (53,593) | $ (474,284)

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