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Accounting Pronouncements (Effects of Adoption of ASU 2018-12 Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Statements Adjusted [Abstract] |  |  |
Deferred policy acquisition costs, net | $ 123,015 | $ 121,224 |
Assets | 20,330,165 | 19,058,758 | $ 19,002,576
Policy benefits and losses, claims and loss expenses payable | 829,992 | 849,113 |
Deferred Income Tax Liabilities, Net | 1,507,604 | 1,447,125 |
Total liabilities | 12,698,832 | 11,886,313 |
Accumulated other comprehensive loss | (187,238) | (223,216) |
Retained earnings | 8,023,000 | 7,600,090 |
Stockholders' Equity Attributable to Parent | 7,631,333 | 7,172,445 |
Liabilities and Equity | 20,330,165 | 19,058,758 |
Operating Segments [Member] | Life Insurance [Member] |  |  |
Statements Adjusted [Abstract] |  |  |
Assets | $ 3,174,307 | $ 2,990,903 |

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