Derivatives and Hedging Activities (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jan. 01, 2012
Other Current Assets [Member]
Designated cash flow hedges, assets
Foreign exchange contracts, assets	$ 4,149	$ 14,890
Foreign exchange contracts not designated, assets	2,789	6,203
Total derivatives, assets	6,938	21,093
Other Non Current Assets [Member]
Designated cash flow hedges, assets
Foreign exchange contracts, assets	0	0
Foreign exchange contracts not designated, assets	0	0
Total derivatives, assets	0	0
Other Current Accrued Liabilities [Member]
Designated cash flow hedges, liabilities
Foreign exchange contracts, liabilities	1,243	3,265
Foreign exchange contracts not designated, liabilities	3,029	36,780
Total derivatives, liabilities	4,272	40,045
Non-current liabilities [Member]
Designated cash flow hedges, liabilities
Foreign exchange contracts, liabilities	0	0
Foreign exchange contracts not designated, liabilities	2,487	5,790
Total derivatives, liabilities	2,487	5,790
Foreign exchange contracts [Member] | Other Current Assets [Member]
Designated cash flow hedges, assets
Foreign exchange contracts, assets	4,149	14,890
Foreign exchange contracts [Member] | Other Non Current Assets [Member]
Designated cash flow hedges, assets
Foreign exchange contracts, assets	0	0
Foreign exchange contracts [Member] | Other Current Accrued Liabilities [Member]
Designated cash flow hedges, liabilities
Foreign exchange contracts, liabilities	1,243	3,265
Foreign exchange contracts [Member] | Non-current liabilities [Member]
Designated cash flow hedges, liabilities
Foreign exchange contracts, liabilities	$ 0	$ 0