Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013 subsidiary	Mar. 31, 2013 Segment	Dec. 31, 2014 Segment	Dec. 31, 2013	Dec. 31, 2012
Schedule of Useful Lives [Line Items]
Number of Subsidiaries Included in Business Acquisition	2
Number of reportable segments		2	2
Maximum Maturity Term to Be Considered Cash and Cash Equivalents			3 months
Goodwill, Impairment Loss			$ 0
Foreign Currency Transaction Gain (Loss), before Tax			(1,466)	945	(2,144)
Research and Development Expense			$ 15,782	$ 14,707	$ 8,696
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