Financial Instruments and Derivatives (Details) (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Carrying amounts and fair values of financial instruments
Long-term debt, net of current portion	$ 716,807	$ 603,941	[1]
Carrying Amount [Member]
Carrying amounts and fair values of financial instruments
Long-term debt, net of current portion	716,807	603,941
Fair Value [Member]
Carrying amounts and fair values of financial instruments
Long-term debt, net of current portion	$ 739,649	$ 624,786

[1] The year-end condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by generally accepted accounting principles.