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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Net long-term deferred assets and (liabilities) relating to: |  |
Accounts receivable and inventory reserves | $ 401 | $ 318
Warranty accrual | 3,105 | 2,698
Other accruals | 2,445 | 1,395
Share-based compensation | 1,697 | 1,432
Donations | 80 | 152
Other, net | 851 | 698
Total deferred income tax assets | 8,579 | 6,693
Property & equipment | (19,405) | (14,670)
Total deferred income tax liabilities | (19,405) | (14,670)
Net deferred income tax liabilities | $ 10,826 | $ 7,977

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