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Reportable Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Segment
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net revenue        
Total net revenue $ 59,090 $ 50,088 $ 176,358 $ 144,722
Direct profit contribution        
Total direct profit contribution 28,540 23,843 86,537 68,976
Adjustments:        
Stock-based compensation (763) (470) (2,050) (1,286)
Overhead allocations (5,998) (4,413) (16,933) (12,985)
Other, net 2,767 3,094 7,802 7,618
Gross Profit 24,546 22,054 75,356 62,323
Reportable Segments (Textual) [Abstract]        
Number of operating segments 3      
Number of reportable segments 3      
NALA [Member]
       
Net revenue        
Net revenue 37,647 31,952 110,720 88,383
Direct profit contribution        
Direct profit contribution, Home Country 20,928 18,263 60,101 48,765
EMEA [Member]
       
Net revenue        
Net revenue 14,159 12,365 45,425 41,612
Direct profit contribution        
Direct profit contribution, Foreign Country 6,739 5,042 23,809 18,537
APJ [Member]
       
Net revenue        
Net revenue 7,284 5,771 20,213 14,727
Direct profit contribution        
Direct profit contribution, Foreign Country $ 873 $ 538 $ 2,627 $ 1,674