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Business Acquisition - Acquisition and Integration Expenses (Details) - TVN [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 29, 2017
Sep. 30, 2016
Sep. 29, 2017
Sep. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs   $ 534   $ 3,855  
Business Combination, Integration Related Costs $ 117 4,734 $ 2,734 7,912  
Business Combination, Acquisition and Integration Related Expenses         $ 16,900
Cost of Goods, Product Line [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs   0   0  
Business Combination, Integration Related Costs 0 119 342 610  
Research and Development Expense [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs   0   0  
Business Combination, Integration Related Costs 0 152 7 702  
Selling, General and Administrative Expenses [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs   534   3,855  
Business Combination, Integration Related Costs 117 4,365 2,385 6,502  
Operating Expense [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs   534   3,855  
Business Combination, Integration Related Costs $ 117 4,636 $ 2,734 7,814  
Investment Income (Expense) [Member]          
Business Acquisition [Line Items]          
Business Combination, Integration Related Costs   $ 98   $ 98