Future Minimum Lease Payments Under Operating and Finance Leases (Details) - USD ($) $ in Thousands		Oct. 02, 2020		Dec. 31, 2019
Operating Lease
2020 (remainder of year)		$ 1,159
2021		7,183
2022		6,233
2023		5,184
2024		4,575
Thereafter		25,706
Total minimum lease payments		50,040
Less: Interest		(11,988)
Present value of lease liabilities		38,052		$ 39,151
Finance Lease
2020 (remainder of year)	[1]	357
2021	[1]	9,660
2022	[1]	907
2023	[1]	930
2024	[1]	954
Thereafter	[1]	4,440
Total minimum lease payments	[1]	17,248
Less: Interest	[1]	(1,693)
Present value of lease liabilities		$ 15,555	[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.