Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details)

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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 31, 2016
USD ($)
Number of operating segments | item 1      
Accounts Receivable and Net investment in sales-type leases        
Allowance for doubtful accounts receivable $ 1,110 $ 1,160    
Allowance for doubtful accounts due to investment in sales-type leases 1,689 1,575    
Inventories        
Inventory write-downs for obsolescence and excess inventories 8,600 6,300    
Other Intangible Assets        
Impairment of Intangible Assets (Excluding Goodwill) 2,200 2,200 $ 16,900  
Advertising costs 15,900 14,200 19,400  
Retirement Plans and Employee Rights Upon Termination        
Severance pay liabilities 4,000 3,900    
Deposit in insurance policies and pension funds 3,100 3,000    
Severance expenses 4,100 3,100 3,000  
401(k) Plan contributions $ 3,200 $ 3,700 $ 3,800  
Research and Development Costs        
Maximum additional tax rate on distribution of dividends 10.00%      
Settlement percentage 50.00%      
Vesting period 4 years      
Stock-Based Compensation        
Expected dividend rate (as a percent) 0.00%      
Business Combinations        
Increase in retained earnings $ 1,400     $ 2,100
Right-of-use assets and lease liabilities      
Minimum [Member]        
Lease liabilities 24,000      
Maximum [Member]        
Lease liabilities $ 28,000