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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Accrued employee benefits and compensation | $ 5,730 | $ 4,269 |  |
Tax loss and credit carryforwards | 17,761 | 18,604 |  |
Reserves and accruals | 5,996 | 4,935 |  |
Operating leases | 904 | 0 |  |
Other | 2,210 | 1,953 |  |
Total deferred tax assets | 32,601 | 29,761 |  |
Less deferred tax asset valuation allowance | (14,625) | (16,889) | $ (8,754) | $ (6,388)
Total deferred tax assets, net of valuation allowance | 17,976 | 12,872 |  |
Deferred tax liabilities |  |  |  |
Depreciation and amortization | 4,025 | 8,335 |  |
Postretirement benefit obligations | 1,719 | 3,234 |  |
Unremitted earnings | 1,624 | 1,778 |  |
Operating leases | 908 | 0 |  |
Other | 1,803 | 2,094 |  |
Total deferred tax liabilities | 10,079 | 15,441 |  |
Net deferred tax asset (liability) | $ 7,897 |  |  |
Net deferred tax asset (liability) |  | $ (2,569) |  |

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