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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Available for sale debt securities, short-term investments, amortized cost $ 831,127 $ 643,715
Available for sale, short-term investments, amortized cost 0 10,000
Equity securities, at fair value (cost: $86,271 and $68,040) $ 86,271 $ 68,040
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) 46,514,000 45,778,000
Common stock, shares outstanding (in shares) 34,783,000 34,735,000
Treasury stock, shares (in shares) 11,731,000 11,043,000