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Segment Information Property & Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Property & equipment, net $ 3,399,604 $ 3,396,295
North American & European Operations [Member]
   
Segment Reporting Information [Line Items]    
Property & equipment, net 2,760,992 2,766,693
Australian Operations [Member]
   
Segment Reporting Information [Line Items]    
Property & equipment, net $ 638,612 $ 629,602