Property And Equipment - (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 446,578	$ 477,155
Less allowance for depreciation	(361,023)	(371,006)
Property and equipment, net	85,555	106,149
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	338,857	358,061
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	81,219	91,389
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,831	12,774
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 14,671	$ 14,931