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Contingent Liabilities (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Loss Contingencies [Line Items]      
Number of lawsuits against the company | item 5 3  
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 100 $ 100  
Total Product Liability Expense $ 2,055 $ 920 $ 774
Number of new lawsuits | item 3 2  
Number of settled lawsuits | item 1 1