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Shareholders' Equity (Summary Of RSA Award Activity) (Details) - Restricted Stock Awards (RSAs) - $ / shares
3 Months Ended 12 Months Ended
Apr. 01, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Unvested (in shares) 19,593  
Granted (in shares) 0  
Vested (in shares) 0  
Forfeited (in shares) 0  
Unvested (in shares) 19,593 19,593
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Unvested, weighted average fair value at grant date (in dollars per share) $ 57.43  
Granted, weighted average fair value at grant date (in dollars per share) 0.00  
Vested, weighted average fair value at grant date (in dollars per share) 0.00  
Forfeited, weighted average fair value at grant date (in dollars per share) 0.00  
Unvested, weighted average fair value at grant date (in dollars per share) $ 57.43 $ 57.43
Unvested, weighted average remaining contractual term (years) 1 month 6 days 4 months 24 days