Property And Equipment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 470,241	$ 477,155
Less allowance for depreciation	(376,760)	(371,006)
Property and equipment, net	93,481	106,149
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	353,389	358,061
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	89,467	91,389
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	12,448	12,774
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 14,937	$ 14,931