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Revenue Recognition - Revenue Disaggregated by Products and Services (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Revenue from External Customer [Line Items]        
Revenue $ 199,047 $ 211,264 $ 372,531 $ 380,831
Standard Products and Services        
Revenue from External Customer [Line Items]        
Revenue 173,368 183,627 334,420 342,026
Application-Specific Customer Solutions        
Revenue from External Customer [Line Items]        
Revenue $ 25,679 $ 27,637 $ 38,111 $ 38,805