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Income Taxes Components of Deferred Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Components of Deferred Tax Assets |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | $ 1,000 | $ 780
Deferred Tax Assets, Inventory | 5,230 | 6,410
Deferred Tax Assets, Goodwill and Intangible Assets | 0 | 3,120
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 20,350 | 26,110
Deferred Tax Assets, Operating Loss and Credit Carryforwards | 7,290 | 6,680
Deferred Tax Assets, Gross | 33,870 | 43,100
Deferred Tax Assets, Valuation Allowance | (6,400) | (5,670)
Deferred Tax Assets, Net of Valuation Allowance | 27,470 | 37,430
Components of Deferred Tax Liabilities |  |
Deferred Tax Liabilities, Property, Plant and Equipment | (16,380) | (14,580)
Deferred Tax Liabilities, Goodwill and Intangible Assets | (5,350) | 0
Deferred Tax Liabilities, Investment in Foreign Affiliates, Including Withholding Tax | (740) | (1,140)
Deferred Tax Liabilities, Other | (1,550) | (1,330)
Deferred Tax Liabilities, Gross | (24,020) | (17,050)
Deferred Tax Assets, Net | $ 3,450 | $ 20,380

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