Marketable Debt Securities (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 29, 2012	Dec. 31, 2011
Investments of marketable debt securities [Abstract]
Amortized cost	$ 82,718	$ 30,021
Unrealized Gains	37	41
Unrealized Losses	(5)	0
Marketable debt securities	82,750	30,062
Amortized Cost [Abstract]
Marketable debt securities - current (due in less than one year)	47,216	20,004
Marketable debt securities - non-current (due in one to two years)	35,502	10,017
Marketable debt securities	82,718	30,021
Fair Value [Abstract]
Marketable debt securities - current (due in less than one year)	47,232	20,020
Marketable debt securities - non-current (due in one to two years)	35,518	10,042
Marketable debt securities	82,750	30,062
U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritesNet	10,000
Investments of marketable debt securities [Abstract]
Amortized cost	35,031	30,021
Unrealized Gains	19	41
Unrealized Losses	0	0
Marketable debt securities	35,050	30,062
Corporate bonds [Member]
Investments of marketable debt securities [Abstract]
Amortized cost	26,870
Unrealized Gains	11
Unrealized Losses	(3)
Marketable debt securities	26,878
Agency Securities [Member]
Investments of marketable debt securities [Abstract]
Amortized cost	15,124
Unrealized Gains	7
Unrealized Losses	0
Marketable debt securities	15,131
Municipal bonds [Member]
Investments of marketable debt securities [Abstract]
Amortized cost	5,693
Unrealized Gains	0
Unrealized Losses	(2)
Marketable debt securities	$ 5,691

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Total fair value of debt securities categorized neither as held-to-maturity nor trading.

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The cash inflow, net of purchased interest received, associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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