Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)	Jun. 30, 2012	Dec. 31, 2011
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	95,496,604	94,497,526
Treasury stock, shares	6,407,673	2,803,987