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Statement of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Supplemental cash flow information      
Cash paid during the period for interest $ 11,354 $ 13,417 $ 9,979
Cash paid during the period for income taxes, including foreign withholding tax 18,637 18,961 29,838
Non-cash investing and financing activities:      
Stock options assumed for acquisition 0 1,600 0
Available-for-sale securities received from customer 20 352 1,431
Receivables related to sales of cost-method investments $ 4,911 $ 0 $ 0