Income Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Pension and other postretirement costs	$ 3,770	$ 3,600
Inventories	2,095	2,103
Net operating/capital loss and interest carryforwards	11,895	9,536
Tax credit carryforwards	1,431	748
Deferred compensation	2,865	2,009
Other accruals and reserves	3,362	3,547
Book over tax depreciation	0	12
Total gross deferred tax assets	25,418	21,555
Less: valuation allowance	(14,867)	(14,455)
Deferred tax assets, net of valuation allowance	10,551	7,100
Deferred tax liabilities:
Tax over book depreciation	(290)	0
Investment in subsidiary	(1,845)	(1,983)
Intangible assets, including tax deductible goodwill	(5,745)	(884)
Total gross deferred tax liabilities	(7,880)	(2,867)
Net deferred tax assets	$ 2,671	$ 4,233