Leases - Lease Costs (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 29, 2019 USD ($)	Sep. 29, 2019 USD ($)
Leases [Abstract]
Finance lease cost: Amortization of right-of-use assets	$ 112	$ 536
Finance lease cost: Interest on lease liabilities	12	31
Operating lease cost	6,023	17,624
Short-term lease cost	363	1,509
Variable lease cost	561	1,319
Total lease cost	7,071	21,019
Operating cash flows from finance leases	12	31
Operating cash flows from operating leases	5,653	16,158
Financing cash flows from finance leases	291	808
Right-of-use assets obtained in exchange for new finance lease liabilities	252	803
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 1,437	$ 7,973
Weighted-average remaining lease term – finance leases (in years)	2 years 3 months	2 years 3 months
Weighted-average remaining lease term – operating leases (in years)	10 years 9 months	10 years 9 months
Weighted-average discount rate – finance leases (percentage)	2.25%	2.25%
Weighted-average discount rate – operating leases (percentage)	5.85%	5.85%