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Summary of Significant Accounting Policies - Revenue by product families (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues: (in thousands) $ 13,564,764 $ 17,510,780 $ 13,498,196
Mobile handheld computer and related product and service
      
Revenues: (in thousands) 7,186 11,345 9,840
Cordless barcode scanning and related product and service
      
Revenues: (in thousands) 5,371 5,983 2,038
Other
      
Revenues: (in thousands) $ 396 $ 795 $ 1,620