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Stock Plans (Summary of Restricted Stock Award Activity) (Details) - Restricted Stock Awards [Member]
shares in Thousands
9 Months Ended
Oct. 02, 2016
$ / shares
shares
Restricted stock award activity  
Number of Shares, Nonvested at beginning of period | shares 502
Number of Shares, Granted | shares 278
Number of Shares, Vested | shares (206)
Number of Shares, Forfeited | shares (53)
Number of Shares, Nonvested at end of period | shares 521
Weighted-Average Grant-Date Fair Value, Nonvested at beginning of period | $ / shares $ 42.61
Weighted-Average Grant-Date Fair Value, Granted | $ / shares 47.34
Weighted-Average Grant-Date Fair Value, Vested | $ / shares 38.94
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares 45.21
Weighted-Average Grant-Date Fair Value, Nonvested at end of period | $ / shares $ 46.31