Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 714,807	$ 672,225
Less accumulated depreciation	(405,951)	(372,790)
Property, plant and equipment, net	308,856	299,435
Depreciation expense	39,654	41,875	$ 34,419
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,153	19,422
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	156,294	145,142
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 539,360	$ 507,661