Marketable Securities (Tables)

3 Months Ended

Mar. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-Sale Securities Reconciliation

The Company’s marketable securities within cash equivalents and investments included in the consolidated balance sheets are detailed as follows (in thousands):

	March 30, 2019
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gain		Loss			Value
U.S. Treasury securities	$	98,723	$	12	$	(159	)	$	98,576
Foreign government securities		3,489		1		(14	)		3,476
Corporate debt securities		368,163		121		(663	)		367,621
Time deposits		52,507		—		—			52,507
Total	$	522,882	$	134	$	(836	)	$	522,180
Amounts included in:
Cash equivalents	$	39,886	$	1	$	—		$	39,887
Investments		482,996		133		(836	)		482,293
Total	$	522,882	$	134	$	(836	)	$	522,180

	December 31, 2018
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gain		Loss			Value
U.S. Treasury securities	$	164,619	$	16	$	(320	)	$	164,315
Foreign government securities		3,486		1		(24	)		3,463
Corporate debt securities		725,778		41		(2,760	)		723,059
Time deposits		108,638		—		—			108,638
Total	$	1,002,521	$	58	$	(3,104	)	$	999,475
Amounts included in:
Cash equivalents	$	60,532	$	—	$	(1	)	$	60,531
Investments		941,989		58		(3,103	)		938,944
Total	$	1,002,521	$	58	$	(3,104	)	$	999,475

Investments Classified By Contractual Maturity Date

The estimated fair value of marketable debt securities by maturity date is as follows (in thousands):

	March 30, 2019		December 31, 2018
Due in one year or less	$	437,648	$	797,649
Due after one year through three years		84,532		201,826
Total	$	522,180	$	999,475