Short-Term Investments (Tables)

6 Months Ended

Jun. 28, 2013

Cash And Cash Equivalents [Abstract]

Summary of Short-Term Investments

The following table summarizes the Company’s short-term investments (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
As of June 28, 2013
Certificates of deposit	$	1,607	$	—	$	—		$	1,607
State, municipal and local government agencies bonds		41,565		36		(4	)		41,597
Corporate bonds		25,459		1		(35	)		25,425
Commercial paper		3,846		—		—			3,846
U.S. federal government bonds		6,006		—		(3	)		6,003
Total short-term investments	$	78,483	$	37	$	(42	)	$	78,478
As of December 31, 2012
Certificates of deposit	$	1,603	$	—	$	—		$	1,603
State, municipal and local government agencies bonds		59,009		45		(4	)		59,050
Corporate bonds		31,568		4		(10	)		31,562
Commercial paper		10,287		1		—			10,288
U.S. federal government bonds		2,003		—		—			2,003
Total short-term investments	$	104,470	$	50	$	(14	)	$	104,506

Maturities of Short-Term Investments

The following table summarizes the maturities of the Company’s short-term investments (in thousands):

	June 28, 2013		December 31, 2012
Less than one year	$	53,589	$	76,779
Due in 1 - 2 years		24,889		27,727
Total short-term investments	$	78,478	$	104,506