Leases - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019	Dec. 31, 2019
Leases [Abstract]
Operating Lease, Liability	$ 28,836,000		$ 28,836,000		$ 17,973,000
Operating lease, right-of-use asset	25,819,000		25,819,000		17,522,000
Operating lease, liability, current	7,628,000		7,628,000		5,647,000
Operating lease, liability, noncurrent	21,208,000		21,208,000		$ 12,326,000
Operating lease, cost	2,147,000	$ 1,742,000	4,053,000	$ 3,227,000
Operating lease, payments	2,091,000	1,669,000	3,954,000	3,070,000
Lease, cost	$ 23,000	$ 64,000	$ 62,000	$ 233,000
Weighted average discount rate	4.10%	4.80%	4.10%	4.80%
Weighted average remaining lease term	5 years 3 months 18 days	3 years 7 months 6 days	5 years 3 months 18 days	3 years 7 months 6 days
Operating lease asset impairment charges	$ 2,534,000		$ 2,534,000	$ 0
Carrying value operating lease right-of-use assets impaired	0		0
Rental income	$ 0	$ 81,000	$ 77,000	$ 158,000