Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 488,657	$ 474,768
Less: accumulated depreciation	(338,718)	(318,929)
Net property, plant and equipment	149,939	155,839
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,774	2,929
Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	113,141	114,324
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	363,290	345,064
Construction in Progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,452	$ 12,451