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Contingent Liabilities (Schedule of Product Liability Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Product Liability Contingency [Line Items]      
Total Product Liability Expense $ 718 $ 1,514 $ 360
Accrued Legal Expense [Member]      
Product Liability Contingency [Line Items]      
Total Product Liability Expense [1] (37) 731 (477)
Product Insurance Premium Expense [Member]      
Product Liability Contingency [Line Items]      
Total Product Liability Expense [2] $ 755 $ 783 $ 837
[1] The expense accrued in the liability is for legal fees only. In 2017 and 2019, the costs incurred related to cases that were settled or dismissed were less than the amounts accrued for these cases in prior years.
[2] Insurance expense represents the cost of insurance premiums.