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Property And Equipment (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Mar. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   $ 338,965,000 $ 351,562,000
Less allowance for depreciation   (291,870,000) (304,955,000)
Property and equipment, net   47,095,000 46,607,000
Advance Payment from Sale of Property $ 3,524,000    
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   283,000,000 296,078,000
Land, buildings and improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   32,611,000 33,054,000
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   9,619,000 9,898,000
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   7,305,000 9,023,000
Capitalized Software [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   $ 6,430,000 $ 3,509,000