Other Assets - Components of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other Assets [Abstract]
Loaned securities	$ 203,693	$ 112,139
Company-owned life insurance	106,417	105,331
Prepaid reinsurance premiums	100,443	141,402
Right-of-use assets	16,292	21,099
Other	32,960	47,053
Total other assets	$ 459,805	$ 427,024
Operating lease, right-of-use asset, statement of financial position [extensible enumeration]	Total other assets	Total other assets