Investments in Cash Equivalents and Marketable Securities (Tables)

9 Months Ended

Sep. 29, 2012

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities

The cost, net unrealized holding gains, net unrealized holding losses and fair value of available-for-sale investments by types and classes of security at September 29, 2012 consisted of the following:

At September 29, 2012	Cost		Net unrealized holding gains		Net unrealized holding losses		Fair Value
Available-for-sale-included in cash equivalents:
U.S. treasury securities	$	853	$	—	$	—	$	853
Corporate debt securities	14,098		—		—		14,098
Money market funds and other	38,218		—		—		38,218
U.S. government-sponsored enterprise securities	3,499		—		—		3,499
Available-for-sale-included in short-term marketable securities:
U.S. government-sponsored enterprise securities	4,999		—		—		4,999
U.S. treasury securities	6,672		—		—		6,672
Corporate debt securities	14,934		—		—		14,934
Certificates of deposit	3,586		—		—		3,586
	$	86,859	$	—	$	—	$	86,859

The cost, net unrealized holding gains, net unrealized holding losses and fair value of available-for-sale investments by types and classes of security at December 31, 2011 consisted of the following:

At December 31, 2011	Cost		Net unrealized holding gains		Net unrealized holding losses			Fair Value
Available-for-sale-included in cash equivalents:
Corporate debt securities	$	24,010	$	—	$	—		$	24,010
Money market funds and other	40,793		—		—			40,793
U.S. government-sponsored enterprise securities	4,000		—		—			4,000
Available-for-sale-included in short-term marketable securities:
Municipal notes	9,295		—		—			9,295
U.S. treasury securities	7,501		—		—			7,501
U.S. government-sponsored enterprise securities	16,506		—		(1		)	16,505
Corporate debt securities	12,704		1		—			12,705
	$	114,809	$	1	$	(1	)	$	114,809