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Business Combination (Schedule Of Identifiable Assets Acquired And Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]    
Goodwill $ 13,804 $ 13,714
Emerald Medical Services And Emerald Extrusion Services [Member]    
Business Acquisition [Line Items]    
Current assets 3,161  
Property, plant and equipment 360  
Intangible assets 6,400  
Goodwill 4,253  
Noncurrent assets 169  
Current liabilities (1,105)  
Noncurrent liabilities (1,423)  
Total consideration paid $ 11,815