Property And Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 435,031	$ 446,578
Less allowance for depreciation	(354,604)	(361,023)
Property and equipment, net	80,427	85,555
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	332,838	338,857
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	76,772	81,219
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,217	11,831
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 14,204	$ 14,671