Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Reconciliation of United States Federal Statutory Corporate Tax Rate to Company's Effective Tax Rate, or Income Tax Provision

A reconciliation of the United States federal statutory corporate tax rate to the Company’s income tax expense, or effective tax rate, was as follows:

	Three-months Ended				Nine-months Ended
	September 30, 2018		October 1, 2017		September 30, 2018		October 1, 2017
Income tax provision at federal statutory corporate tax rate	21	%	35	%	21	%	35	%
State income taxes, net of federal benefit	1	%	1	%	1	%	1	%
Foreign tax rate differential	(7	)%	(18	)%	(7	)%	(18	)%
Tax credit	—	%	(1	)%	—	%	(1	)%
Discrete tax benefit related to Tax Act 2017	(9	)%	—	%	(4	)%	—	%
Discrete tax benefit related to stock option exercises	(4	)%	(7	)%	(5	)%	(13	)%
Other discrete tax events	(2	)%	(2	)%	(1	)%	(1	)%
Other	1	%	1	%	1	%	1	%
Income tax provision	1	%	9	%	6	%	4	%