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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Contingently redeemable common stock, issued shares 0 1,000,000
Contingently redeemable common stock, outstanding shares 0 1,000,000
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 12,000
Cumulative convertible preferred stock, shares outstanding 10,000 12,000
Cumulative convertible preferred stock, minimum liquidation preference $ 9.99 $ 8.49
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 55,000,000 55,000,000
Common stock, shares issued 45,595,000 43,769,000
Common stock, shares outstanding 35,628,000 34,102,000
Treasury stock, shares 9,967,000 9,667,000