Weighted Average Common Shares (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Weighted Average number of shares outstanding - basic and diluted
Common shares - basic	337,235,000	325,383,000	336,435,000	325,037,000
Effect of dilutive securities
Restricted common stock	1,187,000	1,251,000	1,412,000	1,341,000
Stock options	2,001,000	848,000	1,867,000	815,000
Common shares - diluted	340,423,000	327,482,000	339,714,000	327,193,000
Weighted Average Common Shares (Textuals) [Abstract]
Stock options issued			2,142,270	2,738,625
Restricted stock issued			713,280	927,470
Out-of-the money options	1,618,000	4,224,000	2,153,000	4,230,000

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