Short-Term Investments (Tables)

6 Months Ended

Jun. 27, 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 June 27, 2014
State, municipal and local government agencies bonds	$	35,412	$	41	$	(33	)	$	35,420
Corporate bonds	30,112		16		(11		)	30,117
Commercial paper	5,694		—		—			5,694
U.S. federal government bonds	4,004		3					4,007
Total short-term investments	$	75,222	$	60	$	(44	)	$	75,238
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):

	June 27, 2014		December 31, 2013
Less than one year	$	52,594	$	55,278
Due in 1 - 2 years	22,644		24,974
Total short-term investments	$	75,238	$	80,252