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Summary of Significant Accounting Policies (Basic and diluted earnings per share - Table) (Details) (USD $)
In Thousands, except Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Basic earnings per share:    
Net income attributable to Foster Wheeler AG$ 36,858$ 51,720$ 123,138$ 182,638
Weighted-average number of shares outstanding for basic earnings per share118,611,912125,459,735121,852,185126,810,748
Basic earnings per share$ 0.31$ 0.41$ 1.01$ 1.44
Diluted earnings per share:    
Net income attributable to Foster Wheeler AG$ 36,858$ 51,720$ 123,138$ 182,638
Weighted-average number of shares outstanding for basic earnings per share118,611,912125,459,735121,852,185126,810,748
Effect of dilutive securities:    
Options to purchase shares61,39960,199250,526148,650
Non-vested portion of restricted share units128,170191,298286,923203,651
Weighted-average number of shares outstanding for diluted earnings per share118,801,481125,711,232122,389,634127,163,049
Diluted earnings per share$ 0.31$ 0.41$ 1.01$ 1.44