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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - $ / shares
Jun. 30, 2016
Dec. 31, 2015
Statement Of Financial Position [Abstract]    
Cumulative convertible preferred stock, par value $ 0.01 $ 0.01
Cumulative convertible preferred stock, shares authorized 1,000,000 1,000,000
Cumulative convertible preferred stock, shares issued 10,000 10,000
Cumulative convertible preferred stock, shares outstanding 10,000 10,000
Cumulative convertible preferred stock, minimum liquidation preference $ 9.99 $ 9.99
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 55,000,000 55,000,000
Common stock, shares issued 45,262,000 45,525,000
Common stock, shares outstanding 35,064,000 35,110,000
Treasury stock, shares 10,198,000 10,415,000