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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Accounting Policies [Abstract] |  |  |
Number of operating segments | item | 1 |  |
Accounts Receivable and Net investment in sales-type leases |  |  |
Allowance for doubtful accounts receivable | $ 939 | $ 1,110 |
Allowance for doubtful accounts due to investment in sales-type leases | 414 | 1,689 |
Inventories |  |  |
Inventory write-downs for obsolescence and excess inventories | 11,700 | 11,200 |
Other Intangible Assets |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  | 2,200 | $ 2,200
Advertising costs | 16,200 | 15,900 | 14,200
Retirement Plans and Employee Rights Upon Termination |  |  |
Severance pay liabilities | 4,200 | 4,000 |
Deposit in insurance policies and pension funds | 3,300 | 3,100 |
Severance expenses | 4,000 | 4,100 | 3,100
401(k) Plan contributions | $ 4,200 | $ 3,200 | $ 3,700
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 |  |

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