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INCOME TAXES. (Details 2) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforward | $ 40,989 | $ 45,709 |
R&D and AMT credits | 1,797 | 2,465 |
Railcar contracts | 1,415 | 3,348 |
Stock-based compensation | 738 | 946 |
Allowance for doubtful accounts and other assets | 637 | 856 |
Derivatives | 267 | 1,228 |
Pension liability | 2,939 | 2,204 |
Other | 2,097 | 4,316 |
Total deferred tax assets | 50,879 | 61,072 |
Deferred tax liabilities: |  |  |
Property and equipment | (25,194) | (45,757) |
Intangibles | (749) | (1,091) |
Debt basis |  |  |
Other | (521) | (1,593) |
Total deferred tax liabilities | (26,464) | (48,441) |
Valuation allowance | (24,639) | (12,683) | $ (39,838)
Net deferred tax liabilities | $ (224) | $ (52) |

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