Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Fixed-maturities available for sale, amortized cost	$ 4,550,954	$ 5,498,422
Trading securities, amortized cost	70,050	89,479
Equity securities, cost	45,619	144,579
Reinvested cash collateral held under securities lending agreements	62,212	125,723
Reinsurance recoverables, paid losses	$ 1,788	$ 415
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	485,000	485,000
Common stock, shares, issued (in shares)	156,913	168,350
Common stock, shares, outstanding (in shares)	135,498	147,569
Treasury stock (in shares)	21,415	20,782