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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Accrued employee benefits and compensation | $ 4,269 | $ 8,410 |  |
Tax loss and credit carryforwards | 18,604 | 7,905 |  |
Reserves and accruals | 4,935 | 4,699 |  |
Other | 1,953 | 2,977 |  |
Total deferred tax assets | 29,761 | 23,991 |  |
Less deferred tax asset valuation allowance | (16,889) | (8,754) | $ (6,388) | $ (6,202)
Total deferred tax assets, net of valuation allowance | 12,872 | 15,237 |  |
Deferred tax liabilities |  |  |  |
Depreciation and amortization | 8,335 | 14,300 |  |
Postretirement benefit obligations | 3,234 | 2,311 |  |
Unremitted earnings | 1,778 | 3,100 |  |
Other | 2,094 | 224 |  |
Total deferred tax liabilities | 15,441 | 19,935 |  |
Net deferred tax asset (liability) | $ (2,569) | $ (4,698) |  |

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