Income Taxes Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$ 9,885	$ 8,045
Deferred Tax Assets, Tax Credit Carryforwards	2,925	934
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	14,573	14,937
Deferred Tax Assets, Inventory	2,587	2,738
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	4,931	5,571
Deferred Tax Assets, Unrealized Currency Losses	7,221	7,994
Deferred Tax Assets, Other	3,208	3,247
Deferred Tax Assets, Gross	45,330	43,466
Deferred Tax Assets, Valuation Allowance	(9,963)	(10,862)	$ (7,200)
Deferred Tax Assets, Net	35,367	32,604
Deferred Tax Liabilities, Goodwill and Intangible Assets, Intangible Assets	(7,061)	(5,876)
Deferred Tax Liabilities, Property, Plant and Equipment	(5,774)	(8,372)
Deferred Tax Liabilities, Deferred Expense, Capitalized Interest	0	(10,111)
Deferred Tax Liabilities, Unrealized Currency Transaction Gains	(4,206)	(6,421)
Deferred Tax Liabilities, Other	(3,998)	(1,579)
Deferred Tax Liabilities	(21,039)	(32,359)
Deferred Tax Assets (Liabilities), Net	14,328	245
Deferred Tax Assets, Net, Current	0	3,164
Deferred Tax Liabilities, Current	0	(9,731)
Deferred Tax Assets, Net, Noncurrent	20,605	11,693
Deferred Tax Liabilities, Noncurrent	$ (6,277)	$ (4,881)