Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Common Stock, par value	$ 0.001	$ 0.001
Common Stock, shares authorized	35,000,000	35,000,000
Common Stock, shares outstanding	27,564,902	27,214,144
Treasury Stock, shares	1,923,682	1,719,706