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Contingent Liabilities (Schedule of Product Liability Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Product Liability Contingency [Line Items]      
Total Product Liability Expense $ 2,055 $ 920 $ 774
Accrued Legal Expense [Member]      
Product Liability Contingency [Line Items]      
Total Product Liability Expense [1] 1,221 (77) 1,069
Product Insurance Premium Expense [Member]      
Product Liability Contingency [Line Items]      
Total Product Liability Expense [2] $ 834 $ 997 $ (295)
[1] The expense accrued in the liability is for legal fees only. In 2014 and 2015, 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.