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Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Selected financial information by reportable operating segment        
Revenues $ 633,573 $ 640,013 $ 1,861,997 $ 1,743,742
Adjusted EBITDA 148,370 154,273 445,650 406,770
Capital expenditures 52,940 40,881 146,527 126,183
U.S. [Member]
       
Selected financial information by reportable operating segment        
Revenues 416,165 441,334 1,271,155 1,216,679
Adjusted EBITDA 94,538 110,285 302,222 289,091
Capital expenditures 27,357 17,871 74,160 57,316
International [Member]
       
Selected financial information by reportable operating segment        
Revenues 220,633 201,637 598,880 534,828
Adjusted EBITDA 53,832 43,988 143,428 117,679
Capital expenditures 25,583 23,010 72,367 68,867
Eliminations [Member]
       
Selected financial information by reportable operating segment        
Revenues $ (3,225) $ (2,958) $ (8,038) $ (7,765)