Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011
Derivatives designated as hedging instruments under FASB ASC 815-20 [Member]
Summary of company's derivative instruments
Asset Derivatives at Fair Value	$ 7,584	$ 0
Liability Derivatives at Fair Value	0	2,290
Derivatives designated as hedging instruments under FASB ASC 815-20 [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign currency exchange contracts [Member]
Summary of company's derivative instruments
Asset Derivatives at Fair Value	1,308	0
Derivatives designated as hedging instruments under FASB ASC 815-20 [Member] | Accrued Liabilities [Member] | Foreign currency exchange contracts [Member]
Summary of company's derivative instruments
Liability Derivatives at Fair Value	0	2,290
Derivatives designated as hedging instruments under FASB ASC 815-20 [Member] | Other Assets [Member]
Summary of company's derivative instruments
Interest rate cap	6,276	0
Derivatives designated as hedging instruments under FASB ASC 815-20 [Member] | Other Long term liabilities [Member]
Summary of company's derivative instruments
Interest rate cap	0	0
Derivatives not designated as hedging instruments under FASB ASC 815-20 [Member]
Summary of company's derivative instruments
Asset Derivatives at Fair Value	11,863	834
Liability Derivatives at Fair Value	532	3,282
Derivatives not designated as hedging instruments under FASB ASC 815-20 [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign currency exchange contracts [Member]
Summary of company's derivative instruments
Asset Derivatives at Fair Value	4,279	834
Derivatives not designated as hedging instruments under FASB ASC 815-20 [Member] | Accrued Liabilities [Member] | Foreign currency exchange contracts [Member]
Summary of company's derivative instruments
Liability Derivatives at Fair Value	$ 532	$ 992