Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Rental expense	$ 6,043	$ 5,464	$ 5,897
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	307,710	293,210
Less: Accumulated depreciation	(185,681)	(167,758)
Total property, plant and equipment	122,029	125,452
Future minimum lease commitments for operating leases
2017	6,170
2018	5,862
2019	5,717
2020	2,348
2021	1,182
Thereafter	2,505
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,027	4,027
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	90,780	90,272
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	205,674	193,630
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 7,229	$ 5,281