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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Goodwill and other intangible assets | $ 5,773 | $ 10,952
Stock-based compensation | 7,607 | 7,550
Deferred compensation | 5,387 | 5,184
Warranty | 9,282 | 11,679
Inventory | 5,591 | 6,572
Other | 2,978 | 5,000
Total deferred tax assets | 36,618 | 46,937
Fixed assets | (12,462) | (14,948)
Net deferred tax assets | $ 24,156 | $ 31,989

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