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Commitments and Contingencies (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 01, 2017
USD ($)
Oct. 02, 2016
USD ($)
Oct. 01, 2017
USD ($)
Lease_Option
Oct. 02, 2016
USD ($)
Operating Leased Assets [Line Items]        
Lease renewal term     5 years  
Rent expense | $ $ 7.2 $ 6.6 $ 21.5 $ 19.8
Minimum        
Operating Leased Assets [Line Items]        
Lease renewal options     0  
Maximum        
Operating Leased Assets [Line Items]        
Lease renewal options     3