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Statement of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Jan. 01, 2011
Jan. 02, 2010
Supplemental cash flow information      
Cash Paid During the Year for interest $ 13,417 $ 9,979 $ 7,188
Cash paid during the period for Income taxes, including foreign withholding tax 18,961 29,838 8,277
Non-Cash Investing and Financing Activities:      
Stock options assumed for acquisition 1,600    
Available-for-sale securities received from customer $ 352 $ 1,431