Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Series A convertible participating preferred stock, shares issued	0	0
Series A convertible participating preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.002	$ 0.002
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	75,893,066	78,141,491
Common stock, shares outstanding	75,893,066	78,141,491
Treasury stock, shares	2,668,744	0