Leases - Supplemental Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows from finance leases	$ 1,384	$ 340	$ 1,384	$ 937
Operating cash flows from finance leases	0	0	0	0
Operating cash flows from operating leases	6,390	8,526	12,929	14,038
ROU assets obtained in exchange for lease obligations:
Finance lease liabilities	0	0	1,384	0
Operating lease liabilities	$ 0	$ 0	$ 4,497	$ 288
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets		us-gaap:OtherAssets