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Income Taxes - Deferred Income Tax Balances (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
U.S. foreign tax credit |  | $ 7,027
Stock and long-term compensation plans | $ 1,855 | 2,304
Foreign NOL & other carryforwards | 20,864 | 16,340
US state NOL carryforwards | 823 | 803
US alternative minimum tax |  | 357
Deferred revenue | 1,278 | 358
Pension liability, net | 974 | 1,038
Reserve for uncertain tax issues |  | (445)
Amortization and depreciation | 753 | 708
Accrued expenses and other | 1,246 | 523
Total gross deferred tax assets | 27,793 | 29,013
Less: Valuation allowance | (12,805) | (6,274)
Net deferred income tax assets | 14,988 | 22,739
Deferred tax liabilities: |  |
Accruals | 506 | 691
US tax on unremitted foreign earnings |  | 424
Foreign tax on unremitted foreign earnings | 7,434 |
Intangible assets | 9,341 | 10,947
Deferred tax liabilities | 17,281 | 12,062
Net deferred tax assets |  | $ 10,677
Net deferred tax liabilities | $ (2,293) |

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