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Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Selected financial information by reportable operating segment        
Revenues $ 649,606 $ 620,593 $ 1,228,424 $ 1,103,729
Adjusted EBITDA 156,952 149,791 297,280 252,497
Capital Expenditures 46,603 49,533 93,587 85,302
U.S. [Member]
       
Selected financial information by reportable operating segment        
Revenues 443,765 444,479 854,990 775,345
Adjusted EBITDA 103,391 110,015 207,684 178,806
Capital Expenditures 27,109 27,977 46,803 39,445
International [Member]
       
Selected financial information by reportable operating segment        
Revenues 208,372 178,720 378,247 333,191
Adjusted EBITDA 53,561 39,776 89,596 73,691
Capital Expenditures 19,494 21,556 46,784 45,857
Eliminations [Member]
       
Selected financial information by reportable operating segment        
Revenues $ (2,531) $ (2,606) $ (4,813) $ (4,807)