Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 640,049	$ 635,594
Less accumulated depreciation	367,515	357,616
Net property, plant and equipment	272,534	277,978
Land
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	19,871	20,353
Buildings
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	102,236	97,485
Machinery and equipment
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	470,862	448,241
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	14,313	15,431
Software
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	23,630	19,950
Construction in progress
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 9,137	$ 34,134