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INCOME TAXES. (Details 2) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ 48,082 | $ 40,989 |
R&D, energy and AMT credits | 4,247 | 1,797 |
Disallowed interest | 3,769 |  |
Railcar contracts | 650 | 1,415 |
Stock-based compensation | 782 | 738 |
Allowance for doubtful accounts and other assets | 643 | 637 |
Derivatives | 1,214 | 267 |
Pension liability | 2,941 | 2,939 |
Other | 2,134 | 2,097 |
Total deferred tax assets | 64,462 | 50,879 |
Deferred tax liabilities: |  |  |
Property and equipment | (23,013) | (25,194) |
Intangibles | (749) | (749) |
Other | (363) | (521) |
Total deferred tax liabilities | (24,125) | (26,464) |
Valuation allowance | (40,588) | (24,639) | $ (12,683)
Net deferred tax liabilities, included in other liabilities | $ (251) | $ (224) |

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