Future Minimum Lease Payments Under Operating and Finance Leases (Details) - USD ($) $ in Thousands		Jul. 03, 2020		Dec. 31, 2019
Operating Lease
2020 (remainder of year)		$ 2,842
2021		6,929
2022		6,036
2023		5,091
2024		4,559
Thereafter		25,975
Total minimum lease payments		51,432
Less: Interest		(13,157)
Present value of lease liabilities		38,275		$ 39,151
Finance Lease
2020 (remainder of year)	[1]	788
2021	[1]	9,314
2022	[1]	907
2023	[1]	930
2024	[1]	954
Thereafter	[1]	4,440
Total minimum lease payments	[1]	17,333
Less: Interest	[1]	(1,876)
Present value of lease liabilities		$ 15,457	[1]	$ 16,152

[1] Future minimum lease payments under finance leases include the exercise price of an option to purchase a facility in Germany in 2021.