Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Total fixed-maturities available for sale	$ 5,643,884	$ 5,367,729
Trading securities amortized cost	188,570	234,382
Equity securities, fair value cost	156,648	176,229
Reinvested cash collateral held under securities lending agreements	67,107	48,652
Reinsurance recoverables, paid losses	$ 17	$ 51
Common stock, par or stated value per share	$ 0.001	$ 0.001
Common stock, shares authorized	485,000	485,000
Common stock, shares, issued	185,822	194,408
Common stock, shares, outstanding	166,388	175,421
Treasury stock, shares	19,434	18,987