Other Assets and Liabilities - Schedule of Other Liabilities (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
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| Other Assets and Liabilities [Abstract] | ||||||||||
| Reinsurance payables | [1] | $ 192,534 | $ 10,957 | |||||||
| Current federal and foreign income taxes | [2] | 128,705 | 34,772 | |||||||
| Reinsurance funds withheld | [3] | 126,112 | 123,866 | |||||||
| Amount payable under securities lending agreements | [4] | 77,166 | 62,212 | |||||||
| Tax and license fees payable | 34,139 | 7,420 | ||||||||
| Accrued compensation | 33,581 | 48,257 | ||||||||
| Lease liability | 33,443 | 22,120 | ||||||||
| Other | 72,309 | 56,866 | ||||||||
| Total other liabilities | $ 697,989 | $ 366,470 | ||||||||
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| X | ||||||||||
- Definition Other Assets and Liabilities. No definition available.
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| X | ||||||||||
- Definition Payable under securities lending agreements. No definition available.
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| X | ||||||||||
- Definition Tax and License Fees Payable1 No definition available.
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| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of funds held as security for payments to be received under reinsurance contracts. No definition available.
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| X | ||||||||||
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of liabilities classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The aggregate carrying amount, as of the balance sheets date, of obligations not otherwise itemized or categorized in the footnotes to the financial statements. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements. No definition available.
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