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Long-Lived Assets by Geographic Area (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Long-lived assets $ 76,932 $ 79,191
United States
   
Segment Reporting Information [Line Items]    
Long-lived assets 62,644 60,098
MEXICO
   
Segment Reporting Information [Line Items]    
Long-lived assets 6,348 6,473
the Netherlands
   
Segment Reporting Information [Line Items]    
Long-lived assets 5,299 4,707
Other international
   
Segment Reporting Information [Line Items]    
Long-lived assets $ 2,641 $ 7,913