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Acquisitions (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 29, 2015
Jun. 30, 2015
Jun. 30, 2014
Business Acquisition [Line Items]      
Payments to acquire business   $ 8,393 $ 0
Xennia Technology Ltd. [Member]      
Business Acquisition [Line Items]      
Payments to acquire business $ 8,393    
Purchase price excess on carrying value of the net assets allocated to intangible assets and goodwill 6,000    
Acquisition related costs $ 900