Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 04, 2021	Mar. 31, 2020
Operating Leases
Amortization of ROU assets	$ 157
Interest on lease liabilities	19
Operating lease cost	6,130	$ 6,263
Short-term lease cost	1,465	1,602
Variable lease cost	1,338	1,466
Total lease cost	9,109	9,331
Operating cash flows from operating leases	5,208	1,587
Operating cash flows from finance leases	76
Financing cash flows for finance leases	19
ROU assets obtained in exchange for operating lease liabilities	79	$ 329
ROU assets obtained in exchange for finance lease liabilities	$ 439
Weighted-average remaining lease term (in years)	18 years 9 months 7 days
Weighted-average discount rate	6.89%
Weighted-average remaining finance lease term (in years)	3 years 5 months 4 days
Weighted-average discount rate	3.83%