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Earnings Per Share (Details 1) - shares
3 Months Ended 9 Months Ended
Sep. 29, 2017
Sep. 30, 2016
Sep. 29, 2017
Sep. 30, 2016
Stock Appreciation Rights (SARs)        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock appreciation rights excluded from diluted EPS calculation 219,292 982,588 370,917 993,418