Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Amortized cost on fixed maturities trading investments	$ 4,651,732	$ 4,982,459
Cost - equity security trading investments	530,996	795,068
Cost - short-term investments	208,121	283,792
Reinsurance recoverable, allowance for credit losses	(1,192)	0
Fixed assets, accumulated depreciation	$ 332,172	$ 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