Property And Equipment - (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Asset Disposals, Pretax	$ 4,031,000
Property and equipment, gross	395,548,000	$ 425,760,000
Less allowance for depreciation	(316,865,000)	(346,101,000)
Property and equipment, net	78,683,000	79,659,000
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	299,721,000	318,286,000
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	73,830,000	81,219,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,031,000	11,738,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 11,966,000	$ 14,517,000