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Stock-based Compensation Expense Tables (Tables)
9 Months Ended
Sep. 28, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule Of Share Based Payment Award SARs Valuation Assumptions [Table Text Block]
The Company estimated the fair value of the SARs using the following weighted-average assumptions in the Black-Scholes model:
Risk-free interest rate
 
2.58
%
Dividend yield
 
0.8
%
Volatility
 
31.9
%
Expected term (in years)
 
5.5