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Contingent Liabilities (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]      
Minimum limit of per claim for providing insurance coverage on annual basis | $ $ 5,000    
Maximum limit of aggregate loss incurred annually for providing insurance coverage on annual basis | $ 10,000    
Total amount of damages claimed | $ 1,100 $ 100  
Total Product Liability Expense | $ $ 1,139 $ 718 $ 1,514
Number of new lawsuits 1 2  
Number of settled lawsuits 1 3  
Number of defendants 3 3  
Traditional Lawsuits [Member]      
Loss Contingencies [Line Items]      
Number of defendants 2 2  
Municipal Lawsuits [Member]      
Loss Contingencies [Line Items]      
Number of defendants 1 1