Fair Value Measurement, Financial Instruments And Risk Management (Amounts Affecting Consolidated Statement Of Operations) (Details) (Derivatives not designated as hedging instruments:, Other gain (loss), net, Foreign exchange forwards and options, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Derivatives not designated as hedging instruments: | Other gain (loss), net | Foreign exchange forwards and options
Fair Value Disclosures [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 545	$ (30)