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Property And Equipment (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 349,282,000 $ 357,390,000  
Less allowance for depreciation (305,686,000) (311,406,000)  
Property and equipment, net 43,596,000 45,984,000  
Net Book Value of Assets Sold     $ 2,900,000
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 297,750,000 301,039,000  
Land, buildings and improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 32,519,000 37,606,000  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 9,204,000 8,847,000  
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 9,809,000 $ 9,898,000