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Goodwill and Other Intangible Assets Acquisition information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 10, 2015
Jul. 03, 2016
Jul. 03, 2016
Dec. 31, 2015
Jun. 28, 2015
Dec. 31, 2014
Business Acquisition [Line Items]            
Goodwill   $ 257,281 $ 257,281 $ 145,607 $ 167,936 $ 170,773
DCG Systems [Member] [Member]            
Business Acquisition [Line Items]            
Percentage of Voting Interests Acquired 100.00%          
Consideration Transferred, Net of Cash Acquired $ 161,800          
Consideration Transferred 182,226          
Transaction Costs       $ 3,300    
Goodwill 109,246          
Revenue   20,700 34,500      
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   $ 1,200 $ (500)      
Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 41,480