Investments in Cash Equivalents and Marketable Securities (Tables)

6 Months Ended

Jul. 02, 2011

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 July 2, 2011 consisted of the following:

At July 2, 2011	Cost		Net unrealized holding gains		Net unrealized holding losses		Fair Value
Available-for-sale-included in cash equivalents:
Corporate debt securities	$	34,597	$	—	$	—	$	34,597
Money market funds and other	82,434		—		—		82,434
Available-for-sale-included in short-term marketable securities:
Municipal notes	30,495		—		—		30,495
U.S. government-sponsored enterprise securities	8,420		—		—		8,420
U.S. treasury securities	4,057		2		—		4,059
Corporate debt securities	1,276		—		—		1,276
Certificates of deposit	360		—		—		360
	$	161,639	$	2	$	—	$	161,641

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, 2010 consisted of the following:

At December 31, 2010	Cost		Net unrealized holding gains		Net unrealized holding losses			Fair Value
Available-for-sale-included in cash equivalents:
U.S. treasury securities	$	5,500	$	—	$	—		$	5,500
Certificates of deposit	325		—		—			325
Money market funds and other	114,217		—		—			114,217
Available-for-sale-included in short-term marketable securities:
U.S. treasury securities	3,115		—		(2		)	3,113
U.S. government-sponsored enterprise securities	26,366		4		—			26,370
Certificate of deposits	1,709		—		—			1,709
	$	151,232	$	4	$	(2	)	$	151,234