Cash, Cash Equivalents, and Investments (Tables)

3 Months Ended

Mar. 30, 2014

Cash and Cash Equivalents [Abstract]

Components of Cash, Cash Equivalents, and Investments

Cash, cash equivalents, and investments consisted of the following (in thousands):

	March 30, 2014		December 31, 2013
Cash	$	36,740	$	40,124
Money market instruments	5,723		520
Cash and cash equivalents	42,463		40,644
Corporate bonds	33,585		109,040
Municipal bonds	4,766		9,276
Sovereign bonds	3,016		11,448
Asset-backed securities	410		53,559
Agency bonds	—		1,499
Short-term investments	41,777		184,822
Corporate bonds	190,767		109,909
Treasury bills	86,804		73,666
Asset-backed securities	74,475		21,820
Sovereign bonds	17,401		16,385
Municipal bonds	7,013		5,919
Agency bonds	1,500		—
Limited partnership interest	1,956		1,956
Long-term investments	379,916		229,655
	$	464,156	$	455,121

Summary of Available-for-Sale Investments

The following table summarizes the Company’s available-for-sale investments as of March 30, 2014 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Short-term:
Corporate bonds	$	33,480	$	105	$	—		$	33,585
Municipal bonds	4,758		8		—			4,766
Sovereign bonds	2,996		20		—			3,016
Asset-backed securities	410		—		—			410
Long-term:
Corporate bonds	190,185		680		(98		)	190,767
Treasury bills	86,941		2		(139		)	86,804
Asset-backed securities	74,471		69		(65		)	74,475
Sovereign bonds	17,367		52		(18		)	17,401
Municipal bonds	6,968		45		—			7,013
Agency bonds	1,500		—		—			1,500
	$	419,076	$	981	$	(320	)	$	419,737

Gross Unrealized Losses and Fair Values for Available-for-Sale Investments

The following table summarizes the Company’s gross unrealized losses and fair values for available-for-sale investments in an unrealized loss position as of March 30, 2014 (in thousands):

	Unrealized Loss Position For:
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate bonds	$	55,024	$	(98	)	$	—	$	—		$	55,024	$	(98	)
Asset-backed securities	23,535		(38		)	8,456		(27		)	31,991		(65		)
Sovereign bonds	3,347		(18		)	—		—			3,347		(18		)
Treasury bills	82,753		(139		)	—		—			82,753		(139		)
	$	164,659	$	(293	)	$	8,456	$	(27	)	$	173,115	$	(320	)

Effective Maturity Dates of Available-for-Sale Investments

The following table presents the effective maturity dates of the Company’s available-for-sale investments as of March 30, 2014 (in thousands):

	1 Year or Less		1-2 Years		2-3 Years		3-4 Years		4-5 Years		5-8 Years		Total
Corporate bonds	$	33,585	$	64,435	$	94,424	$	2,428	$	29,480	$	—	$	224,352
Treasury bills	—		32,317		54,487		—		—		—		86,804
Asset-backed securities	410		5,287		14,663		29,396		21,243		3,886		74,885
Sovereign bonds	3,016		12,502		4,899		—		—		—		20,417
Municipal bonds	4,766		3,981		1,475		1,557		—		—		11,779
Agency bonds	—		—		1,500		—		—		—		1,500
	$	41,777	$	118,522	$	171,448	$	33,381	$	50,723	$	3,886	$	419,737