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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) customer | Dec. 31, 2016 USD ($) customer | Dec. 31, 2015 USD ($) customer
Schedule of Accounting Policies [Line Items] |  |  |
Investments in certificates of deposit | $ 2,900 | $ 5,500 |
Certificates of deposit interest rate, lower range | 0.95% |  |
Certificates of deposit interest rate, upper range | 1.10% |  |
Investments held to maturity | $ 6,077 | 14,083 |
Research and development costs | 13,000 | 12,000 | $ 7,500
Advertising expense | 1,700 | 1,400 | 1,200
Shipping and handling fees | 11,400 | 10,300 | 9,600
Payments to representatives | $ 51,800 | $ 55,000 | $ 55,400
Extended product warranties, minimum length | 6 months |  |
Extended product warranties, maximum length | 10 years |  |
Foreign Sales Revenue, Net |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 4.00% | 4.00% | 4.00%
Sales Revenue, Net |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Number of major customers | customer | 1 | 1 | 1
Accounting for More Than 5% of Accounts Receivable |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Number of major customers | 0 | 0 |
Concentration risk, percentage | 5.00% | 5.00% |
Minimum |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Certificates of deposit maturity dates | 1 month |  |
Investments maturity date | 1 month |  |
Maximum |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Certificates of deposit maturity dates | 5 months |  |
Investments maturity date | 4 months |  |

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