Property and Equipment, Net - Property and Equipment Table (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 383,450	$ 367,190
Less: Accumulated depreciation	197,650	188,030
Property and equipment, net	185,800	179,160
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,180	14,910
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	72,770	71,100
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 295,500	$ 281,180