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Business Acquisition - Acquisition and Integration Expenses (Details) - TVN [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Jun. 30, 2017
Jul. 01, 2016
Dec. 31, 2016
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs   $ 885   $ 3,321  
Business Combination, Integration Related Costs $ 467 2,518 $ 2,617 3,178  
Business Combination, Acquisition and Integration Related Expenses   6,500   6,500 $ 16,900
Cost of Goods, Product Line [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs   0   0  
Business Combination, Integration Related Costs 0 433 342 491  
Research and Development Expense [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs   0   0  
Business Combination, Integration Related Costs 0 500 7 550  
Selling, General and Administrative Expenses [Member]          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs   885   3,321  
Business Combination, Integration Related Costs $ 467 $ 1,585 $ 2,268 $ 2,137