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Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 25, 2011	Jun. 26, 2010
Cash Flows
Maximum maturity period of liquid investments considered as cash equivalents (in months)	3
Interest	$ 17,409	$ 9,534
Income taxes	$ 18,639	$ 11,869

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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