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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Available-for-sale securities, allowance for credit loss $ 186 $ 0
Available for sale debt securities, amortized cost 815,647 828,336
Equity securities, amortized cost $ 84,667 $ 43,523
Cumulative convertible preferred stock, par value (in dollars 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 dollars per share) $ 9.99 $ 9.99
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 55,000,000 55,000,000
Common stock, shares issued (in shares) 46,817,000 46,707,000
Common stock, shares outstanding (in shares) 31,137,000 32,638,000
Treasury stock, shares (in shares) 15,680,000 14,069,000