Income Taxes Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Tax Assets, Operating Loss Carryforwards	$ 8,045	$ 6,340
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	18,627	14,135
Deferred Tax Liabilities, Property, Plant and Equipment	(8,372)	(6,993)
Deferred Tax Liabilities, Deferred Expense, Capitalized Interest	(10,111)	(6,841)
Deferred Tax Liabilities, Unrealized Currency Transaction Gains	(6,421)	0
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	5,571	4,925
Deferred Tax Assets, Unrealized Currency Losses	7,994	2,289
Deferred Tax Assets, Other	3,229	2,232
Deferred Tax Assets, Gross	43,466	29,921
Deferred Tax Assets, Valuation Allowance	(10,862)	(7,236)
Deferred Tax Assets, Net	32,604	22,685
Deferred Tax Liabilities, Goodwill and Intangible Assets, Intangible Assets	(5,876)	(5,650)
Deferred Tax Liabilities, Other	(1,579)	(3,498)
Deferred Tax Liabilities	(32,359)	(22,982)
Deferred Tax Assets (Liabilities), Net	245	(297)
Deferred Tax Assets, Net, Current	3,164	6,130
Deferred Tax Liabilities, Current	(9,731)	(3,093)
Deferred Tax Assets, Net, Noncurrent	11,693	3,876
Deferred Tax Liabilities, Noncurrent	(4,881)	(7,210)
Foreign Pension Plans, Defined Benefit [Member]
Deferred Tax Assets, Net	$ 2,660	$ 2,953