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Organization and Summary of Significant Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Organization and Summary of Significant Accounting Policies [Abstract] | |||
| Balance at beginning of year | $ 7,872 | $ 6,697 | $ 5,387 |
| Additions charged to sales | 35,923 | 30,450 | 28,690 |
| Sales returns & warranty claims charged against reserve | (35,121) | (29,275) | (27,380) |
| Balance at end of year | $ 8,674 | $ 7,872 | $ 6,697 |