Short-Term Investments (Tables)

3 Months Ended

Mar. 28, 2014

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 March 28, 2014
State, municipal and local government agencies bonds	$	38,754	$	48	$	(17	)	$	38,785
Corporate bonds	30,455		15		(4		)	30,466
Commercial paper	5,291		—		—			5,291
U.S. federal government bonds	4,001		4		—			4,005
Total short-term investments	$	78,501	$	67	$	(21	)	$	78,547
As of December 31, 2013
State, municipal and local government agencies bonds	$	40,426	$	38	$	(15	)	$	40,449
Corporate bonds	33,483		20		(7		)	33,496
Commercial paper	2,299		—		—			2,299
U.S. federal government bonds	4,004		4		—			4,008
Total short-term investments	$	80,212	$	62	$	(22	)	$	80,252

Maturities of Short-Term Investments

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

	March 28, 2014		December 31, 2013
Less than one year	$	56,494	$	55,278
Due in 1 - 2 years	22,053		24,974
Total short-term investments	$	78,547	$	80,252