Fair Value Measurements (Tables)

6 Months Ended

Jul. 01, 2017

Fair Value Disclosures [Abstract]

Schedule of fair value of assets and liabilities measured on recurring basis

The following tables set forth the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):

	July 1, 2017
	Level 1		Level 2		Total
Assets:
Money market funds	$	161,762	$	—	$	161,762
U.S. government agencies	—		39,961		39,961
Corporate debt securities	—		353,046		353,046
Derivative assets	—		361		361
Total	$	161,762	$	393,368	$	555,130
Liabilities:
Derivative liabilities	$	—	$	13,869	$	13,869

	December 31, 2016
	Level 1		Level 2		Total
Assets:
Money market funds	$	50,125	$	—	$	50,125
U.S. government agencies	—		86,526		86,526
Corporate debt securities	—		390,286		390,286
Derivative assets	—		10,625		10,625
Total	$	50,125	$	487,437	$	537,562
Liabilities:
Derivative liabilities	$	—	$	3,780	$	3,780