CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS
Convertible preferred stock, Series B, shares authorized	10,000,000	10,000,000
Convertible preferred stock, Series B, shares issued	35,000	35,000
Convertible preferred stock, Series B, shares outstanding	34,900	35,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	24,691,051	24,382,991
Common stock, shares outstanding	18,556,873	18,183,083
Treasury stock, shares	6,134,178	6,199,908