Cash, Cash Equivalents, and Investments (Tables)

9 Months Ended

Oct. 01, 2017

Cash and Cash Equivalents [Abstract]

Components of Cash, Cash Equivalents, and Investments

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



	October 1, 2017		December 31, 2016
Cash	$	104,649	$	77,307
Money market instruments	6,700		2,334
Cash and cash equivalents	111,349		79,641
Treasury bills	70,184		67,175
Corporate bonds	65,569		141,188
Euro liquidity fund	52,312		46,499
Asset-backed securities	47,840		69,614
Sovereign bonds	20,945		7,298
Municipal bonds	8,805		6,517
Agency bonds	7,606		2,903
Short-term investments	273,261		341,194
Corporate bonds	245,940		169,952
Treasury bills	63,602		92,280
Asset-backed securities	59,069		26,946
Sovereign bonds	8,026		23,585
Agency bonds	5,639		10,339
Municipal bonds	4,225		1,233
Long-term investments	386,501		324,335
	$	771,111	$	745,170

Summary of Available-for-Sale Investments

The following table summarizes the Company’s available-for-sale investments as of October 1, 2017 (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Short-term:
Treasury bills	$	70,311	$	—	$	(127	)	70,184
Corporate bonds	65,484		91		(6		)	65,569
Euro liquidity fund	51,929		383		—			52,312
Asset-backed securities	47,839		13		(12		)	47,840
Sovereign bonds	20,974		5		(34		)	20,945
Municipal bonds	8,805		—		—			8,805
Agency bonds	7,600		6		—			7,606
Long-term:
Corporate bonds	245,046		1,013		(119		)	245,940
Treasury bills	63,704		—		(102		)	63,602
Asset-backed securities	59,038		76		(45		)	59,069
Sovereign bonds	8,059		7		(40		)	8,026
Agency bonds	5,630		9		—			5,639
Municipal bonds	4,219		9		(3		)	4,225
	$	658,638	$	1,612	$	(488	)	$	659,762

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 October 1, 2017 (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
Treasury bills	$	95,174	$	(150	)	$	33,627	$	(79	)	$	128,801	$	(229	)
Asset-backed securities	51,878		(55		)	8,770		(2		)	60,648		(57		)
Corporate bonds	20,106		(33		)	15,154		(92		)	35,260		(125		)
Sovereign bonds	2,495		(5		)	19,854		(69		)	22,349		(74		)
Municipal bonds	1,356		(3		)	—		—			1,356		(3		)
	$	171,009	$	(246	)	$	77,405	$	(242	)	$	248,414	$	(488	)

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 October 1, 2017 (in thousands):



	<1 year		1-2 Years		2-3 Years		3-4 Years		4-5 Years		5-7 Years		Total
Corporate bonds	$	65,569	$	109,918	$	77,430	$	17,223	$	39,956	$	1,413	$	311,509
Treasury bills	70,184		63,602		—		—		—		—		133,786
Asset-backed securities	47,840		35,502		16,075		—		2,328		5,164		106,909
Euro liquidity fund	52,312		—		—		—		—		—		52,312
Sovereign bonds	20,945		4,599		3,427		—		—		—		28,971
Agency bonds	7,606		2,719		—		—		2,920		—		13,245
Municipal bonds	8,805		2,869		1,356		—		—		—		13,030
	$	273,261	$	219,209	$	98,288	$	17,223	$	45,204	$	6,577	$	659,762