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SEGMENT INFORMATION (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Revenue and long-lived assets by geography          
Revenue $ 799,411 $ 680,612 $ 1,541,660 $ 1,321,212  
Long-lived assets (excluding goodwill and intangible assets) 289,493   289,493   270,512
United States
         
Revenue and long-lived assets by geography          
Revenue 551,880 472,553 1,066,494 918,213  
Long-lived assets (excluding goodwill and intangible assets) 267,861   267,861   251,379
All other countries
         
Revenue and long-lived assets by geography          
Revenue 247,531 208,059 475,166 402,999  
Long-lived assets (excluding goodwill and intangible assets) $ 21,632   $ 21,632   $ 19,133