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Share-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 02, 2017
USD ($)
$ / shares
shares
Apr. 03, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSU outstanding | shares 231,309    
Shares available for grant | shares 762,708    
Compensation expense (benefit) $ 0.7 $ 1.5  
Unrecognized compensation costs $ 11.4    
Weighted average period of recognition of compensation expense (in years) 2 years 3 months 22 days    
Weighted average contractual term for stock options outstanding, years 6 years 4 days    
Weighted average contractual term for stock options exercisable, years 5 years 3 months 8 days    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Grant Date Fair Value | $ / shares $ 19.36 $ 11.91  
Stock options outstanding | shares 868,221    
Aggregate intrinsic value of stock options outstanding $ 8.6    
Aggregate intrinsic value of stock options exercisable $ 4.9    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted | shares 53,855 84,578  
Granted RSU awards fair value | $ / shares $ 60.99 $ 38.89  
Aggregate intrinsic value of RSU Awards / RSU MSPs $ 1.5    
Aggregate intrinsic value of RSU Awards outstanding 9.4    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 0.2    
Restricted Stock Units (RSUs) [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance target threshold (as a percent) 0.00%    
Restricted Stock Units (RSUs) [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance target threshold (as a percent) 200.00%    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted | shares 31,369 43,016  
Restricted Stock Units Management Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted | shares 26,726 20,130  
Restricted stock units discount amount | $ / shares 20.13 12.83  
Aggregate intrinsic value of RSU Awards / RSU MSPs $ 0.3    
Aggregate intrinsic value of RSU Awards outstanding 1.8    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Deferred Aggregate Intrinsic Value $ 0.0    
Cash Settled Stock Unit Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSU outstanding | shares 31,072   33,320
Cash used to settle awards $ 0.3    
Accrued expenses and current liabilities for Cash Settled Stock Unit Awards 0.8   $ 1.0
Cash Settled Stock Unit Awards [Member] | Selling, General and Administrative Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense (benefit) (0.1) $ 0.2  
February 2015 [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense (benefit) $ (0.7)