Leases, Balance Sheet Classification (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Operating leases
Operating lease right-of-use assets	$ 68,433
Current portion of operating lease liabilities	17,215
Operating lease liabilities	52,020
Total operating lease liabilities	69,235
Finance leases
Property, plant and equipment, gross	329,204	$ 309,541
Accumulated depreciation	(144,654)	(138,509)
Property, plant and equipment, net	184,550	171,032
Current portion of long-term debt	2,493
Long-term debt	13,730
Total finance lease liabilities	16,223	$ 3,706
Finance Leases [Member]
Finance leases
Property, plant and equipment, gross	24,445
Accumulated depreciation	(6,528)
Property, plant and equipment, net	$ 17,917