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11. INCOME TAXES (Details - Deferred tax assets) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforward | $ 45,709 | $ 53,867 |
Railcar contracts | 3,348 | 5,143 |
Pension liability | 2,204 | 2,647 |
R&D and AMT credits | 2,465 | 2,303 |
Derivatives | 1,228 | 0 |
Litigation accrual | 0 | 1,290 |
Capital leases | 0 | 1,021 |
Stock-based compensation | 946 | 724 |
Allowance for doubtful accounts and other assets | 856 | 0 |
Other | 4,316 | 5,367 |
Total deferred tax assets | 61,072 | 72,362 |
Deferred tax liabilities: |  |  |
Fixed assets | (45,757) | (30,272) |
Intangibles | (1,091) | (1,091) |
Debt basis | 0 | (912) |
Other | (1,593) | (1,423) |
Total deferred tax liabilities | (48,441) | (33,698) |
Valuation allowance | (12,683) | (39,838) | $ (4,147)
Net deferred tax liabilities | (52) | (1,174) |
Classified in balance sheet as: |  |  |
Other liabilities | $ (52) | $ (1,174) |

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