Derivative and Hedgiing Activities Derivative and Hedging Activities (Details) (Foreign Exchange Forward [Member], Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified					3 Months Ended		9 Months Ended
	Sep. 26, 2014 Prepaid Expenses and Other Current Assets [Member]	Dec. 31, 2013 Prepaid Expenses and Other Current Assets [Member]	Sep. 26, 2014 Accrued Liabilities [Member]	Dec. 31, 2013 Accrued Liabilities [Member]	Sep. 26, 2014 Other Income [Member]	Sep. 27, 2013 Other Income [Member]	Sep. 26, 2014 Other Income [Member]	Sep. 27, 2013 Other Income [Member]
Derivatives, Fair Value [Line Items]
Foreign currency contracts	$ 19	$ 196
Foreign currency contracts			(331)	(195)
Gain (loss) recorded in other income (expense), net					$ (95)	$ (157)	$ (201)	$ 658