Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Amortized cost on fixed maturities trading investments	$ 5,175,844	$ 4,982,459
Cost - equity security trading investments	643,014	795,068
Cost - short-term investments	472,878	283,792
Reinsurance recoverable, allowance for credit losses	(266)	0
Fixed assets, accumulated depreciation	$ 331,993	$ 321,454
Common Stock
Common stock, shares authorized (in shares)	70,000,000	70,000,000
Common stock, shares issued (in shares)	55,389,000	55,389,000
Common stock, shares outstanding (in shares)	55,389,000	55,389,000