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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | ---
Deferred tax assets |  |  |  |  |
Accrued employee benefits and compensation | $ 8,410 | $ 9,899 |  |  |
Postretirement benefit obligations | 0 | 3,335 |  |  |
Tax loss and credit carryforwards | 7,905 | 7,146 |  |  |
Reserves and accruals | 4,699 | 6,361 |  |  |
Other | 2,977 | 2,792 |  |  |
Total deferred tax assets | 23,991 | 29,533 |  |  |
Less deferred tax asset valuation allowance | (8,754) | (6,388) |  | $ (6,202) | $ (7,691)
Deferred tax liabilities, undistributed foreign earnings |  |  | $ 6,100 |  |
Total deferred tax assets, net of valuation allowance | 15,237 | 23,145 |  |  |
Deferred tax liabilities |  |  |  |  |
Depreciation and amortization | 14,300 | 14,965 |  |  |
Postretirement benefit obligations | 2,311 | 0 |  |  |
Unremitted earnings | 3,100 | 7,239 |  |  |
Other | 224 | 190 |  |  |
Total deferred tax liabilities | 19,935 | 22,394 |  |  |
Net deferred tax asset | $ (4,698) | $ 751 |  |  |

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