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Segment Information (Details 2) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]    
Property & equipment $ 1,503,388 $ 1,444,177
North American & European Operations [Member]
   
Segment Reporting Information [Line Items]    
Property & equipment 1,012,010 1,000,350
Australian Operations [Member]
   
Segment Reporting Information [Line Items]    
Property & equipment $ 491,378 $ 443,827