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Segment and Geographic Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
countries
Dec. 31, 2011
countries
Dec. 31, 2010
countries
Segment Reporting Information [Line Items]      
Property and equipment, net $ 345,091 $ 293,043  
Revenues derived from Europe 28.00% 29.00% 28.00%
Revenues from outside of the United States 17.00% 18.00% 17.00%
Number of foreign countries greater than 10% revenue 0 0 0
Max amount percentage of revenue for single country 10.00% 10.00% 10.00%
United States [Member]
     
Segment Reporting Information [Line Items]      
Property and equipment, net 225,500 194,000  
Foreign Locations [Member]
     
Segment Reporting Information [Line Items]      
Property and equipment, net $ 119,600 $ 99,000