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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