Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total	$ 486,170	$ 474,768
Less accumulated depreciation	(337,492)	(318,929)
Property, plant, and equipment, net	148,678	155,839	$ 151,352
Land
Property, Plant and Equipment [Line Items]
Total	2,684	2,929
Buildings
Property, Plant and Equipment [Line Items]
Total	111,762	114,324
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total	361,010	345,064
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 10,714	$ 12,451