Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Useful Lives [Line Items]
Maximum Maturity Term to Be Considered Cash and Cash Equivalents	3 months
Impairment of goodwill	$ 0
Impairment of other intangible assets	0
Foreign Currency Transaction Gain (Loss), before Tax	505	$ (1,466)	$ 945
Research and Development Expense	$ 12,688	$ 15,782	$ 14,707
Buildings [Member] | Minimum
Schedule of Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Buildings [Member] | Maximum
Schedule of Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	50 years
Computer equipment [Member] | Minimum
Schedule of Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Computer equipment [Member] | Maximum
Schedule of Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Machinery and equipment [Member] | Minimum
Schedule of Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	4 years
Machinery and equipment [Member] | Maximum
Schedule of Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	12 years
Furnaces and boilers [Member] | Minimum
Schedule of Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	12 years
Furnaces and boilers [Member] | Maximum
Schedule of Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	17 years