Fair Value Measurement, Financial Instruments And Risk Management (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 28, 2014
Fair Value Disclosures [Line Items]
Restructuring related asset impairment			$ 0	$ 172
Carrying amount of assets	$ 76,405		76,405		$ 76,332
Asset Derivatives	14		14		55
Liability Derivatives	69		69		23
Foreign currency forward exchange contracts
Fair Value Disclosures [Line Items]
Notional amount of derivatives not designated as hedging instruments	6,600		6,600
Asset Derivatives	14		14		55
Liability Derivatives	69		69		$ 23
Global Restructuring Plan (including LEAN)
Fair Value Disclosures [Line Items]
Restructuring related asset impairment	$ 0	$ 0	$ 0	172
Fair Value, Measurements, Nonrecurring | Impairment of certain long-lived assets
Fair Value Disclosures [Line Items]
Carrying amount of assets		200		200
Fair Value, Measurements, Nonrecurring | Global Restructuring Plan (including LEAN)
Fair Value Disclosures [Line Items]
Fair value of assets		$ 21		$ 21