Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment Gross Abstract
Land	$ 9,707	$ 9,388
Building and Improvements	80,740	80,110
Machinery and Equipment	140,595	136,329
Construction In Progress	4,964	5,337
Property, Plant and Equipment, Gross, Total	236,006	231,164
Less: Accumulated Depreciation	(150,272)	(143,545)
Property, Plant and Equipment, Net, Total	$ 85,734	$ 87,619