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Segment Information (Details 1) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]    
Income Loss From Continuing Operations Before Provision For Income Tax Segment $ 278,827,000 $ 180,763,000
US Segment Reporting Information [Member]
    
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]    
Income Loss From Continuing Operations Before Provision For Income Tax Segment 174,409,000 92,745,000
Canada Segment Reporting Information [Member]
    
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]    
Income Loss From Continuing Operations Before Provision For Income Tax Segment 36,308,000 55,063,000
Europe And South Africa Segment Reporting Information [Member]
    
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]    
Income Loss From Continuing Operations Before Provision For Income Tax Segment 17,385,000 6,606,000
Asia Pacific Segment Reporting Information [Member]
    
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]    
Income Loss From Continuing Operations Before Provision For Income Tax Segment 14,518,000 32,067,000
Corporate And Other Segment Reporting Information [Member]
    
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]    
Income Loss From Continuing Operations Before Provision For Income Tax Segment $ 36,207,000 $ (5,718,000)