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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Available-for-sale securities, allowance for credit loss $ 290 $ 186
Available for sale debt securities, amortized cost 1,039,042 815,647
Equity securities, amortized cost $ 79,947 $ 84,667
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) 46,964,000 46,817,000
Common stock, shares outstanding (in shares) 31,167,000 31,137,000
Treasury stock, shares (in shares) 15,797,000 15,680,000