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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

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