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Geographic Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
segment
Jun. 30, 2011
Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]          
Number of Reportable Segments     1    
Revenues $ 132,257 $ 129,269 $ 259,128 $ 245,766  
Long-Lived Assets 90,030   90,030   87,357
Americas
         
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 87,945 82,511 173,101 159,949  
Long-Lived Assets 70,682   70,682   67,683
Revenues, Percentage of Americas Sales from U.S. Sales 82.00% 86.00% 83.00% 86.00%  
Asia-Pacific
         
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 34,123 36,052 66,939 65,281  
Long-Lived Assets 17,734   17,734   17,953
Revenues, Percentage of Asia-Pacific Sales from Australia Sales 74.00% 74.00% 75.00% 74.00%  
Europe/RoW
         
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 10,189 10,706 19,088 20,536  
Long-Lived Assets $ 1,614   $ 1,614   $ 1,721