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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Other comprehensive income (loss): |  |  |  |
Other comprehensive loss, before tax | $ (159,010) | $ (45,516) | $ (556,416) | $ (70,704)
Other comprehensive income (loss): |  |  |  |
Other comprehensive income, tax effect | 22,000 | 8,599 | 82,132 | 10,944
Net of Tax |  |  |  |
Balance, beginning of period |  |  | 4,236,114 |
Other comprehensive income (loss): |  |  |  |
Total other comprehensive income (loss) | (137,010) | (36,917) | (474,284) | (59,760)
Balance, end of period | 4,294,208 | 4,167,984 | 4,294,208 | 4,167,984
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Before Tax |  |  |  |
AOCI before tax, beginning of period | (332,126) | 143,136 | 65,280 | 168,324
Other comprehensive income (loss): |  |  |  |
AOCI before tax, end of period | (491,136) | 97,620 | (491,136) | 97,620
Tax Effect |  |  |  |
AOCI tax effect, beginning of period | 45,559 | (27,705) | (14,573) | (30,050)
Other comprehensive income (loss): |  |  |  |
AOCI tax effect, end of period | 67,559 | (19,106) | 67,559 | (19,106)
Net of Tax |  |  |  |
Balance, beginning of period | (286,567) | 115,431 | 50,707 | 138,274
Other comprehensive income (loss): |  |  |  |
Total other comprehensive income (loss) | (137,010) | (36,917) | (474,284) | (59,760)
Balance, end of period | (423,577) | 78,514 | (423,577) | 78,514
Accumulated Net Investment Gains (Losses) On Investments |  |  |  |
Other comprehensive income (loss): |  |  |  |
Unrealized holding gains (losses) arising during the period | (158,835) | (45,295) | (564,064) | (70,095)
Less: Reclassification adjustment for losses (gains) included in net income, before tax | (175) | (221) | 7,648 | (609)
Other comprehensive loss, before tax | (159,010) | (45,516) | (556,416) | (70,704)
Other comprehensive income (loss): |  |  |  |
Unrealized holding gains (losses) arising during the period | 21,899 | 8,548 | 81,051 | 10,923
Less: Reclassification adjustment for losses (gains) included in net income, tax effect | 101 | 51 | 1,081 | 21
Other comprehensive income, tax effect | 22,000 | 8,599 | 82,132 | 10,944
Other comprehensive income (loss): |  |  |  |
Unrealized holding gains (losses) arising during the period | (136,936) | (36,747) | (483,013) | (59,172)
Less: Reclassification adjustment for losses (gains) included in net income, net of tax | (74) | (170) | 8,729 | (588)
Total other comprehensive income (loss) | $ (137,010) | $ (36,917) | $ (474,284) | $ (59,760)

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