Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Common stock par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	97,777,995	95,733,677
Treasury stock, shares	10,413,402	10,115,951