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Comprehensive Income - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning of year | $ 2,954,381 | $ 2,527,564 |
OCI before reclassifications | 30,158 | 116,677 |
Amounts reclassified from AOCI | 5,998 | 8,364 |
Other comprehensive income (loss) | 36,156 | 125,041 | $ (613,141)
End of year | 3,120,076 | 2,954,381 | 2,527,564
Total AOCI |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning of year | (373,001) | (498,042) | 115,099
Other comprehensive income (loss) | 36,156 | 125,041 | (613,141)
End of year | (336,845) | (373,001) | (498,042)
Investments Subtotal |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning of year | (279,070) | (417,035) |
OCI before reclassifications | 25,865 | 131,992 |
Amounts reclassified from AOCI | 2,942 | 5,973 |
Other comprehensive income (loss) | 28,807 | 137,965 |
End of year | (250,263) | (279,070) | (417,035)
Credit Loss Related |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning of year | (84,442) | (121,838) |
OCI before reclassifications | 7,790 | 47,585 |
Amounts reclassified from AOCI | 4,446 | (10,189) |
Other comprehensive income (loss) | 12,236 | 37,396 |
End of year | (72,206) | (84,442) | (121,838)
All Other |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning of year | (194,628) | (295,197) |
OCI before reclassifications | 18,075 | 84,407 |
Amounts reclassified from AOCI | (1,504) | 16,162 |
Other comprehensive income (loss) | 16,571 | 100,569 |
End of year | (178,057) | (194,628) | (295,197)
Defined Benefit Pension and Post-retirement Plans |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning of year | (93,931) | (81,007) |
OCI before reclassifications | 4,293 | (15,315) |
Amounts reclassified from AOCI | 3,056 | 2,391 |
Other comprehensive income (loss) | 7,349 | (12,924) |
End of year | $ (86,582) | $ (93,931) | $ (81,007)

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