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v3.3.1.900

Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) customer | Dec. 31, 2014 USD ($) customer | Dec. 31, 2013 USD ($) customer
Schedule of Accounting Policies [Line Items] |  |  |
Investments in certificates of deposit | $ 12,000 | $ 11,400 |
Certificates of deposit interest rate, lower range | 0.25% |  |
Certificates of deposit interest rate, upper range | 0.90% |  |
Investments held to maturity | $ 17,483 | 15,987 |
Research and development costs | 7,500 | 6,300 | $ 5,200
Advertising expense | 1,200 | 1,000 | 900
Shipping and handling fees | 9,600 | 8,500 | 7,900
Payments to representatives | $ 55,400 | $ 59,700 | $ 63,000
Extended product warranties, minimum length | 6 months |  |
Extended product warranties, maximum length | 10 years |  |
Foreign Sales Revenue, Net [Member] |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 4.00% | 6.00% | 5.00%
Sales Revenue, Net [Member] |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Number of major customers | customer | 1 | 0 | 0
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 | 15 months |  |
Investments maturity date | 15 months |  |

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