Property And Equipment (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 405,359,000	$ 425,760,000
Less allowance for depreciation	(317,129,000)	(346,101,000)
Property and equipment, net	88,230,000	79,659,000
Sale Leaseback Transaction, Net Book Value	15,843,000
Capital Leased Assets, Gross	32,339,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	269,000
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	307,041,000	318,286,000
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	75,341,000	81,219,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,672,000	11,738,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 12,305,000	$ 14,517,000