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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Other comprehensive income (loss): |  |  |  |
Other comprehensive (loss) income | $ 137,407 | $ (89,048) | $ 105,552 | $ (62,011)
Other comprehensive income (loss): |  |  |  |
Other comprehensive (loss) income, tax effect | (20,049) | 12,800 | (15,335) | 8,418
Net of Tax |  |  |  |
Balance, beginning of period |  |  | 5,102,550 |
Other comprehensive income (loss): |  |  |  |
Total other comprehensive income (loss) | 117,358 | (76,248) | 90,217 | (53,593)
Balance, end of period | 5,640,985 | 4,808,007 | 5,640,985 | 4,808,007
Accumulated Other Comprehensive Loss |  |  |  |
Before Tax |  |  |  |
AOCI before tax, beginning of period | (354,847) | (416,193) | (322,992) | (443,230)
Other comprehensive income (loss): |  |  |  |
AOCI before tax, end of period | (217,440) | (505,241) | (217,440) | (505,241)
Tax Effect |  |  |  |
AOCI tax effect, beginning of period | 47,210 | 56,058 | 42,496 | 60,440
Other comprehensive income (loss): |  |  |  |
AOCI tax effect, end of period | 27,161 | 68,858 | 27,161 | 68,858
Net of Tax |  |  |  |
Balance, beginning of period | (307,637) | (360,135) | (280,496) | (382,790)
Other comprehensive income (loss): |  |  |  |
Total other comprehensive income (loss) | 117,358 | (76,248) | 90,217 | (53,593)
Balance, end of period | (190,279) | (436,383) | (190,279) | (436,383)
Accumulated Net Investment Gains (Losses) On Investments |  |  |  |
Other comprehensive income (loss): |  |  |  |
Unrealized holding gains (losses) arising during the period | 137,475 | (89,283) | 103,316 | (64,323)
Less: Reclassification adjustment for (gains) losses included in net income | (68) | 235 | 2,236 | 2,312
Other comprehensive (loss) income | 137,407 | (89,048) | 105,552 | (62,011)
Other comprehensive income (loss): |  |  |  |
Unrealized holding gains (losses) arising during the period | (20,064) | 12,851 | (14,922) | 8,760
Less: Reclassification adjustment for gains (loss) included in net income | 15 | (51) | (413) | (342)
Other comprehensive (loss) income, tax effect | (20,049) | 12,800 | (15,335) | 8,418
Other comprehensive income (loss): |  |  |  |
Unrealized holding (losses) gains arising during the year, net of tax | 117,411 | (76,432) | 88,394 | (55,563)
Less: Reclassification adjustment for (gains) losses included in net income | (53) | 184 | 1,823 | 1,970
Total other comprehensive income (loss) | $ 117,358 | $ (76,248) | $ 90,217 | $ (53,593)

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