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Stock Plans (Summary of Restricted Stock Award Activity) (Details) - Restricted Stock Awards [Member]
shares in Thousands
6 Months Ended
Jul. 02, 2017
$ / shares
shares
Restricted stock award activity  
Number of Shares, Nonvested at beginning of period | shares 521
Number of Shares, Granted | shares 217
Number of Shares, Vested | shares (204)
Number of Shares, Forfeited | shares (15)
Number of Shares, Nonvested at end of period | shares 519
Weighted-Average Grant-Date Fair Value, Nonvested at beginning of period | $ / shares $ 46.48
Weighted-Average Grant-Date Fair Value, Granted | $ / shares 53.92
Weighted-Average Grant-Date Fair Value, Vested | $ / shares 45.57
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares 49.00
Weighted-Average Grant-Date Fair Value, Nonvested at end of period | $ / shares $ 49.87