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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Available for sale debt securities, amortized cost $ 850,658 $ 831,127
Equity securities, amortized cost $ 43,772 $ 86,271
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) 46,713,000 46,514,000
Common stock, shares outstanding (in shares) 33,211,000 34,783,000
Treasury stock, shares (in shares) 13,502,000 11,731,000