Inventories, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished goods	$ 73,918	$ 73,027
Work in process	10,819	14,719
Raw materials and supplies	87,588	87,047
Inventories, net	172,325	174,793
Inventory valuation reserves	$ 27,600	$ 33,500