Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands	Oct. 02, 2011	Dec. 31, 2010
Total assets at fair value	$ 11,629	$ 159,322
Total liabilities at fair value	(5,433)	(761)
Money Market Funds [Member]
Total assets at fair value	6,117	121,943
Money Market Funds [Member] | Level 1 [Member]
Total assets at fair value	6,117	121,943
Money Market Funds [Member] | Level 3 [Member]
Total assets at fair value
Certificates Of Deposit [Member]
Total assets at fair value	3,392	36,268
Certificates Of Deposit [Member] | Level 2 [Member]
Total assets at fair value	3,392	36,268
Certificates Of Deposit [Member] | Level 3 [Member]
Total assets at fair value
Stock [Member]
Total assets at fair value	156	224
Stock [Member] | Level 1 [Member]
Total assets at fair value	156	224
Stock [Member] | Level 2 [Member]
Total assets at fair value
Stock [Member] | Level 3 [Member]
Total assets at fair value
Derivative Instruments - Assets [Member]
Total assets at fair value	1,964	887
Derivative Instruments - Assets [Member] | Level 2 [Member]
Total assets at fair value	1,964	887
Derivative Instruments - Assets [Member] | Level 3 [Member]
Total assets at fair value
Derivative Instruments - Liabilities [Member]
Total liabilities at fair value	(5,433)	(761)
Derivative Instruments - Liabilities [Member] | Level 2 [Member]
Total liabilities at fair value	(5,433)	(761)
Derivative Instruments - Liabilities [Member] | Level 3 [Member]
Total liabilities at fair value
Level 1 [Member]
Total assets at fair value	6,273	122,167
Level 2 [Member]
Total assets at fair value	5,356	37,155
Total liabilities at fair value	(5,433)	(761)
Level 3 [Member]
Total assets at fair value
Total liabilities at fair value