Cash, Cash Equivalents, and Investments (Tables)

6 Months Ended

Jun. 29, 2014

Cash and Cash Equivalents [Abstract]

Components of Cash, Cash Equivalents, and Investments

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

	June 29, 2014		December 31, 2013
Cash	$	38,814	$	40,124
Money market instruments	1,358		520
Cash and cash equivalents	40,172		40,644
Asset-backed securities	33,733		53,559
Corporate bonds	28,013		109,040
Treasury bills	12,996		—
Municipal bonds	5,707		9,276
Sovereign bonds	3,228		11,448
Agency bonds	—		1,499
Short-term investments	83,677		184,822
Corporate bonds	207,767		109,909
Treasury bills	74,971		73,666
Asset-backed securities	36,959		21,820
Sovereign bonds	15,687		16,385
Municipal bonds	4,885		5,919
Agency bonds	1,500		—
Limited partnership interest	1,956		1,956
Long-term investments	343,725		229,655
	$	467,574	$	455,121

Summary of Available-for-Sale Investments

The following table summarizes the Company’s available-for-sale investments as of June 29, 2014 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Short-term:
Asset-backed securities	$	33,721	$	32	$	(20	)	$	33,733
Corporate bonds	27,927		86		—			28,013
Treasury bills	12,995		1		—			12,996
Municipal bonds	5,699		8		—			5,707
Sovereign bonds	3,219		9		—			3,228
Long-term:
Corporate bonds	206,863		920		(16		)	207,767
Treasury bills	74,953		20		(2		)	74,971
Asset-backed securities	36,930		36		(7		)	36,959
Sovereign bonds	15,631		58		(2		)	15,687
Municipal bonds	4,838		47		—			4,885
Agency bonds	1,500		—		—			1,500
	$	424,276	$	1,217	$	(47	)	$	425,446

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 June 29, 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	$	19,003	$	(15	)	$	1,729	$	(1	)	$	20,732	$	(16	)
Treasury bills	19,147		(2		)	—		—			19,147		(2		)
Asset-backed securities	8,050		(2		)	5,679		(25		)	13,729		(27		)
Sovereign bonds	3,363		(2		)	—		—			3,363		(2		)
	$	49,563	$	(21	)	$	7,408	$	(26	)	$	56,971	$	(47	)

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 June 29, 2014 (in thousands):

	1 Year or Less		1-2 Years		2-3 Years		3-4 Years		4-5 Years		Total
Corporate bonds	$	28,013	$	70,775	$	102,454	$	12,061	$	22,477	$	235,780
Treasury bills	12,996		66,770		8,201		—		—		87,967
Asset-backed securities	33,733		17,947		5,506		8,087		5,419		70,692
Sovereign bonds	3,228		12,324		3,363		—		—		18,915
Municipal bonds	5,707		1,848		2,533		504		—		10,592
Agency bonds	—		—		1,500		—		—		1,500
	$	83,677	$	169,664	$	123,557	$	20,652	$	27,896	$	425,446