Weighted Average Common Shares (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Weighted Average number of shares outstanding - basic and diluted
Common shares - basic	337,380,000	325,452,000	336,721,000	325,166,000
Effect of dilutive securities
Restricted common stock	1,268,000	1,369,000	1,372,000	1,354,000
Stock options	1,574,000	813,000	1,745,000	822,000
Common shares - diluted	340,222,000	327,634,000	339,838,000	327,342,000
Weighted Average Common Shares (Textual) [Abstract]
Stock options issued			2,201,445	2,768,715
Restricted stock issued			734,005	944,250
Out-of-the money options	4,180,000	8,932,000	2,763,000	5,797,000