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Segment Information (Details 1) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Segments, Geographical Areas          
United States Revenue $ 373,068 $ 311,790 $ 683,271 $ 567,115  
Other Countries Revenue 137,738 113,066 241,516 222,252  
Total revenues 510,806 424,856 924,787 789,367  
United States Long-lived assets 940,745   940,745   881,416
Other Countries Long-lived assets 454,173   454,173   431,734
Total, net $ 1,394,918   $ 1,394,918   $ 1,313,150