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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Net long-term deferred assets and (liabilities) relating to: |  |
Accounts receivable and inventory reserves | $ 318 | $ 587
Warranty accrual | 2,698 | 3,165
Other accruals | 1,395 | 1,715
Share-based compensation | 1,432 | 1,784
Donations | 152 | 463
Other, net | 698 | 738
Total deferred income tax assets | 6,693 | 8,452
Property & equipment | (14,670) | (17,983)
Total deferred income tax liabilities | (14,670) | (17,983)
Net deferred income tax liabilities | $ 7,977 | $ 9,531

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