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Segment and Geographic Area Information Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]      
Property & equipment $ 3,396,295 $ 1,643,589 $ 1,444,177
North American & European Operations [Member]
     
Segment Reporting Information [Line Items]      
Property & equipment 2,766,693 1,120,121  
Australian Operations [Member]
     
Segment Reporting Information [Line Items]      
Property & equipment $ 629,602 $ 523,468