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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Net long-term deferred assets and (liabilities) relating to: |  |
Accounts receivable and inventory reserves | $ 1,052 | $ 835
Warranty accrual | 3,776 | 3,523
Other accruals | 747 | 1,919
Share-based compensation | 4,102 | 3,906
Donations | 297 | 194
Other, net | 2,457 | 2,140
Total deferred income tax assets | 12,431 | 12,517
Property & equipment | (40,755) | (27,814)
Total deferred income tax liabilities | (40,755) | (27,814)
Net deferred income tax liabilities | $ 28,324 | $ 15,297

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