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Separate Accounts - Schedule of Balances of and Changes in Separate Account Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Dec. 31, 2024
Separate Accounts Disclosure [Abstract] |  |
Separate Account, Liability, Beginning Balance | $ 2,209,287 | $ 2,395,842
Premiums, deposits and transfers | 92,255 | 147,995
Surrenders, withdrawals and transfers | (236,057) | (378,126)
Investment performance | 163,279 | 300,545
Management fees and other charges | (29,601) | (57,734)
Foreign exchange translation | 119,329 | (199,235)
Separate Account, Liability, Ending Balance | 2,318,492 | 2,209,287
Cash surrender value | $ 2,287,152 | $ 2,173,070

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