CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Serial preferred stock; shares authorized	5,000,000	5,000,000
Serial preferred stock; shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	26,237,000	26,207,000
Common stock, shares outstanding	24,843,000	25,155,000
Treasury stock, shares	1,394,000	1,052,000