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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Warranty costs | $ 1,182 | $ 1,643
Sales incentives and discounts | 348 | 725
Stock-based compensation | 611 | 1,015
Pension | 1,406 | 1,993
Uniform capitalization | 47 | 298
All others | 479 | 489
State credits and NOL's | 6,124 | 5,129
Valuation allowance | (5,447) | (4,525)
Total deferred tax assets | 4,750 | 6,767
Deferred tax liabilities: |  |
Depreciation and amortization expense | (781) | (1,103)
Basis differences in joint venture | (320) | (386)
Net deferred tax assets | $ 3,649 | $ 5,278

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