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Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Selected financial information by reportable operating segment    
Revenues $ 578,818 $ 483,136
Adjusted EBITDA 140,328 102,706
Capital Expenditures 46,984 35,769
U.S. [Member]
   
Selected financial information by reportable operating segment    
Revenues 411,225 330,866
Adjusted EBITDA 104,293 68,791
Capital Expenditures 19,694 11,468
International [Member]
   
Selected financial information by reportable operating segment    
Revenues 169,875 154,471
Adjusted EBITDA 36,035 33,915
Capital Expenditures 27,290 24,301
Eliminations [Member]
   
Selected financial information by reportable operating segment    
Revenues $ (2,282) $ (2,201)