Other Assets - Components of Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Other Assets [Abstract]
Loaned securities (Note 5 and 6)	$ 130,369	$ 112,139
Prepaid reinsurance premiums	129,689	141,402
Company-owned life insurance	106,549	105,331
Right-of-use assets	19,818	21,099
Other	32,184	47,053
Total other assets	$ 418,609	$ 427,024