Debt (Tables)

9 Months Ended

Sep. 28, 2019

Debt

Summary of information about the equity and liability components of convertible debt

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

	September 28,		December 29,
	2019		2018
Liability component
Principal	$	400,000	$	400,000
Unamortized debt discount		(30,582)		(39,298)
Unamortized debt issuance costs		(4,616)		(5,931)
Net carrying amount	$	364,802	$	354,771
Equity component
Net carrying amount	$	57,735	$	57,735

Schedule of components of interest expense

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

	Three Months Ended				Nine Months Ended
	September 28,		September 29,		September 28,		September 29,
	2019		2018		2019		2018
Contractual interest expense	$	1,360	$	1,360	$	4,110	$	4,125
Amortization of debt discount		2,930		2,801		8,716		8,322
Amortization of debt issuance costs		442		423		1,315		1,256
	$	4,732	$	4,584	$	14,141	$	13,703