Summary of Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands		Sep. 27, 2019	Dec. 31, 2018
Operating leases
Operating lease right-of-use assets		$ 35,487
Current portion of operating lease liabilities		5,065
Operating lease liabilities		32,181
Total operating lease liabilities		37,246
Finance leases
Finance lease right-of-use assets gross		22,677
Finance lease right-of-use assets accumulated depreciation		(7,537)
Finance lease right-of-use assets		$ 15,140
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		us-gaap:PropertyPlantAndEquipmentNet
Current portion of finance lease liabilities		$ 1,294
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]		us-gaap:OtherAccruedLiabilitiesCurrent
Noncurrent portion of finance lease liabilities		$ 14,960	$ 7,275
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]		us-gaap:OtherLiabilitiesNoncurrent
Total finance lease liabilities	[1]	$ 16,254
Weighted-average remaining lease term (in years)
Operating leases		10 years 1 month 6 days
Finance leases		5 years
Weighted-average discount rate
Operating leases		5.73%
Finance leases		5.06%

[1] Future minimum lease payments under finance lease include the exercise price to purchase a facility in Germany for the year ending December 31, 2020.