Debt (Tables)

6 Months Ended

Jul. 01, 2017

Debt

Summary of information about the equity and liability components of the convertible senior notes

The carrying amount of the Notes consisted of the following (in thousands):

	July 1, 2017
Liability component
Principal	$	400,000
Unamortized debt discount	(55,921		)
Unamortized debt issuance costs	(8,440		)
Net carrying amount	$	335,639
Equity component
Net carrying amount	$	57,735

Schedule of components of interest expense

Interest expense related to the Notes was comprised of the following (in thousands):

	Three Months Ended		Six Months Ended
	July 1, 2017		July 1, 2017
Contractual interest expense	$	1,375	$	1,757
Amortization of debt discount	2,640		3,395
Amortization of debt issuance costs	398		512
	$	4,413	$	5,664