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Consolidated Statements of Equity (Parenthetical)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Shares issued on compensation plans 2,166,605 3,661,797 857,953
Repurchase of common shares 6,216,610    
Common Stock
     
Shares issued on compensation plans 2,166,605 3,661,797 857,953
Repurchase of common shares 6,216,610    
Additional Paid-in Capital
     
Shares issued on compensation plans 2,166,605 3,661,797 857,953
Repurchase of common shares 6,216,610    
Retained Earnings (Accumulated Deficit)
     
Shares issued on compensation plans 2,166,605 3,661,797