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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Net long-term deferred assets and (liabilities) relating to: |  |
Accounts receivable and inventory reserves | $ 625 | $ 1,052
Warranty accrual | 3,675 | 3,776
Other accruals | 1,406 | 1,044
Share-based compensation | 7,568 | 4,102
Intangibles | 993 | (33)
Oklahoma investment credit carryforward | 3,404 | 0
Other, net | 3,119 | 2,608
Gross deferred income tax assets | 20,790 | 12,549
Valuation allowance | (3,404) | 0
Net deferred income tax assets | 17,386 | 12,549
Property & equipment | (49,379) | (40,873)
Total deferred income tax liabilities | (49,379) | (40,873)
Net deferred income tax liabilities | $ 31,993 | $ 28,324

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