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Restructuring and Asset Impairment - Severance and Retention Costs by Classification on the Consolidated Statements of Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 30, 2017
Sep. 24, 2016
Restructuring Cost and Reserve [Line Items]        
Total severance and transition costs $ 690 $ 4,015 $ 2,900 $ 8,135
Cost of services provided and products sold (excluding amortization of intangible assets)        
Restructuring Cost and Reserve [Line Items]        
Total severance and transition costs 240 3,985 1,717 4,478
Selling, general and administrative        
Restructuring Cost and Reserve [Line Items]        
Total severance and transition costs $ 450 $ 30 $ 1,183 $ 3,657