Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Common stock par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in Shares)	200,000,000	200,000,000
Common stock, shares issued (in Shares)	97,585,862	95,733,677
Treasury stock, shares (in Shares)	10,249,304	10,115,951