Other Assets - Components of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Other Assets [Abstract]
Prepaid reinsurance premiums	$ 141,402	$ 201,674
Loaned securities	112,139	103,996
Company-owned life insurance	105,331	113,386
Right-of-use assets	21,099	31,878
Other	$ 47,053	$ 32,246
Operating lease, right-of-use asset, statement of financial position [extensible enumeration]	Total other assets	Total other assets
Total other assets	$ 427,024	$ 483,180