CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Available-for-sale securities, allowance for credit loss	$ 758	$ 920
Available for sale debt securities, amortized cost	1,179,059	1,152,852
Equity securities, amortized cost	$ 89,846	$ 102,431
Cumulative convertible preferred stock, par value (in USD per share)	$ 0.01	$ 0.01
Cumulative convertible preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Cumulative convertible preferred stock, shares issued (in shares)	10,000	10,000
Cumulative convertible preferred stock, shares outstanding (in shares)	10,000	10,000
Cumulative convertible preferred stock, minimum liquidation preference (in USD per share)	$ 9.99	$ 9.99
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	55,000,000	55,000,000
Common stock, shares issued (in shares)	47,266,000	47,179,000
Common stock, shares outstanding (in shares)	30,080,000	30,389,000
Treasury stock, shares (in shares)	17,186,000	16,790,000