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Derivative Instruments (Financial Information Related To Cash Flow Hedges Of Future Revenues) (Details) In Thousands, unless otherwise specified			3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 02, 2011 Euro/US Dollar [Member] Cash Flow Hedge [Member] EUR (€)	Dec. 31, 2010 Euro/US Dollar [Member] Cash Flow Hedge [Member] EUR (€)	Jul. 02, 2011 Cash Flow Hedge [Member] USD ($)	Jul. 03, 2010 Cash Flow Hedge [Member] USD ($)	Jul. 02, 2011 Cash Flow Hedge [Member] USD ($)	Jul. 03, 2010 Cash Flow Hedge [Member] USD ($)	Dec. 31, 2010 Cash Flow Hedge [Member]	Jul. 02, 2011 Euro/US Dollar [Member] EUR (€)	Dec. 31, 2010 Euro/US Dollar [Member] EUR (€)
Notional balance of outstanding contracts versus the dollar	€ 84,585	€ 73,800						€ 50,791	€ 46,307
Hedge effectiveness					100.00%		100.00%
Net gains and (losses) included in revenue			$ 1,819		$ 2,785

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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