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11. INCOME TAXES (Details - Deferred tax assets) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforward | $ 53,867 | $ 12,385 |
Railcar contracts | 5,143 | 0 |
Pension liability | 2,647 | 0 |
R&D and AMT credits | 2,303 | 0 |
Litigation accrual | 1,290 | 0 |
Capital leases | 1,021 | 0 |
Stock-based compensation | 724 | 781 |
Other | 5,367 | 1,944 |
Total deferred tax assets | 72,362 | 15,110 |
Deferred tax liabilities: |  |  |
Fixed assets | (30,272) | (24,813) |
Intangibles | (1,091) | (1,134) |
Debt basis | (912) | 0 |
Other | (1,423) | (450) |
Total deferred tax liabilities | (33,698) | (26,397) |
Valuation allowance | (39,838) | (4,147) | $ (8,422)
Classified in balance sheet as: |  |  |
Deferred tax liabilties | $ (1,174) | $ (15,434) |

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