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Income Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Pension and other postretirement costs $ 3,600 $ 4,295
Inventories 2,103 1,800
Net operating/capital loss carryforwards 9,536 9,523
Tax credit carryforwards 748 0
Deferred compensation 2,009 2,142
Other accruals and reserves 3,547 3,192
Book over tax depreciation 12 0
Total gross deferred tax assets 21,555 20,952
Less: valuation allowance (14,455) (12,434)
Deferred tax assets, net of valuation allowance 7,100 8,518
Deferred tax liabilities:    
Tax over book depreciation 0 (125)
Investment in subsidiary (1,983) (2,214)
Intangible assets, including tax deductible goodwill (884) (713)
Total gross deferred tax liabilities (2,867) (3,052)
Net deferred tax assets $ 4,233 $ 5,466