Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 255,000
Unrecognized Tax Benefits	10,049	$ 8,001	$ 5,523	$ 12,810
Income (Loss) from Continuing Operations before Income Taxes, Domestic	13,237	16,735	$ 28,459
Deferred Tax Asset, Bad Debt Reserve	114	341
Deferred Tax Asset Vacation Accrual	750	939
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Restructuring Charges	83	115
Deferred Tax Assets, Inventory	3,692	3,308
Deferred Tax Assets, Deferred Income	12,423	13,271
Deferred Tax Assets, Operating Loss Carryforwards	49,374	19,434
Deferred Tax Liabilities, Property, Plant and Equipment	3,875	4,666
Deferred Tax Assets, Other	899	369
Deferred Tax Assets, Valuation Allowance	37,208	2,940
Deferred Tax Assets, Net	35,108	$ 39,052
United Kingdom [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	23,800
JAPAN
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	4,500
INDIA
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	3,100
GERMANY
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	101,400
State Taxing Authority [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowances and Reserves, Balance	1,100
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowances and Reserves, Balance	36,100
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	132,800
State Taxing Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	75,200
Federal Taxing Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 47,400