Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	$ 401,086	$ 405,602
Accumulated Depreciation	(295,576)	(294,726)
Property, Plant and Equipment, Net	105,510	110,876
Depreciation expense	38,185	40,890	$ 37,756
Land [Member]
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	2,488	4,130
Buildings [Member]
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	79,182	80,775
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	$ 319,416	$ 320,697