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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 29, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSU outstanding 826,349    
Shares available for grant 413,507    
Compensation expense (benefit) $ 0.7 $ 1.4  
Unrecognized compensation costs $ 13.0    
Weighted average period of recognition of compensation expense (in years) 2 years    
Weighted average contractual term for stock options outstanding, years 3 years 10 months 24 days    
Weighted average contractual term for stock options exercisable, years 3 years 6 months    
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   $ 11.84  
Stock options outstanding 689,418    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted 552,010 154,903  
Granted RSU awards fair value $ 12.70 $ 33.07  
Aggregate intrinsic value of RSU Awards / RSU MSPs $ 1.1    
Aggregate intrinsic value of RSU Awards outstanding 9.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 0.0    
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 109,278 26,475  
Restricted Stock Units Management Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted   56,379  
Restricted stock units discount amount   11.10  
Cash Settled Stock Unit Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSU outstanding 53,513   45,681
Compensation expense (benefit) $ (0.1)    
Cash used to settle awards 0.7    
Accrued expenses and current liabilities for Cash Settled Stock Unit Awards 0.1   $ 0.9
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) $ 0.6 $ 0.4