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Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Supplemental cash flow information
Cash paid during the period for income taxes, including foreign withholding taxes	$ 4,699	$ 3,885
Non-cash Investing and Financing Activities:
Available-for-sale securities received from customer	15
Receivable related to the sale of available-for-sale securities	$ 122

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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