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Contingent Liabilities (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Number of lawsuits against the company | item 4 5  
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 | $ $ 360 $ 2,055 $ 920
Number of new lawsuits | item 0 3  
Number of settled lawsuits | item 0 1  
Number of claims dismissed | item 2 0