Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Deferred tax assets:
Inventories	$ 12,247	$ 12,297
Other postretirement benefits and accrued items	9,271	9,213
Other reserves	6,834	7,847
Foreign tax attributes	5,909	6,252
State tax attributes, net of federal benefit	22,395	27,651
Stock-based compensation	3,378	2,949
Right of Use Liability	5,965
Basis difference in unconsolidated affiliates	6,547	1,067
Total deferred tax assets	72,546	67,276
Less valuation allowance	(23,130)	(25,311)
Deferred tax assets, net of valuation allowance	49,416	41,965
Deferred tax liabilities:
Property, plant, and equipment	47,791	44,910
Pension	949	250
Right of Use Asset	5,967
Other Liabilities	311
Total deferred tax liabilities	55,018	45,160
Net deferred tax liabilities	$ (5,602)	$ (3,195)