Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Land and improvements	$ 67,868	$ 71,002
Buildings and Improvements, Gross	272,123	265,824
Machinery and Equipment, Gross	900,612	864,337
Construction in Progress, Gross	154,139	153,924
Property, Plant and Equipment, Gross	1,394,742	1,355,087
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(553,371)	(522,818)
Property, plant and equipment, net	$ 841,371	$ 832,269