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Segment Information (Total Revenues of Reportable Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Total Revenue [Line Items]    
Total revenues $ 2,657,173 $ 2,601,102
US Traditional Segment Reporting Information [Member]
    
Segment Total Revenue [Line Items]    
Total revenues 1,278,692 1,196,924
US Non-Traditional Segment Reporting Information [Member]
    
Segment Total Revenue [Line Items]    
Total revenues 288,621 314,100
Canada Segment Reporting Information [Member]
    
Segment Total Revenue [Line Items]    
Total revenues 277,749 297,089
Europe And South Africa Segment Reporting Information [Member]
    
Segment Total Revenue [Line Items]    
Total revenues 365,857 307,587
Asia Pacific Segment Reporting Information [Member]
    
Segment Total Revenue [Line Items]    
Total revenues 415,029 409,851
Corporate And Other Segment Reporting Information [Member]
    
Segment Total Revenue [Line Items]    
Total revenues $ 31,225 $ 75,551