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Discontinued Operations (Details Textual)
 1 Months Ended 12 Months Ended
Jan. 31, 2010
USD ($)
Dec. 31, 2011
USD ($)
Project
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Jan. 31, 2010
VEF
Dec. 31, 2009
VEF
Discontinued Operations (Textual) [Abstract]            
Expropriation of investments subject to policy limit   $ 50,000,000        
Insurance policy receivable       50,000,000    
Collection of receivables 50,000,000          
Translation gain 12,200,000          
Remeasurement of Net liabilities Description         4.3 2.15
Asset impairment charges       379,700,000    
Asset impairment charges excluding insurance proceeds       329,700,000    
Benefit Related to the recovery of loss     41,000,000      
Insurance proceeds       $ 50,000,000    
Number of projects   2