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INCOME TAXES. (Details 2) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 61,775 | $ 48,082
R&D, Energy and AMT credits | 3,864 | 4,247
Disallowed interest | 8,242 | 3,769
Railcar contracts | 379 | 650
Stock-based compensation | 551 | 782
Allowance for doubtful accounts and other assets | 578 | 643
Derivatives |  | 1,214
Pension liability | 2,979 | 2,941
Property and equipment | 3,325 |
Other | 3,458 | 2,134
Total deferred tax assets | 85,151 | 64,462
Deferred tax liabilities: |  |
Property and equipment |  | (23,013)
Intangibles | (749) | (749)
Derivatives | (153) |
Other | (437) | (363)
Total deferred tax liabilities | (1,339) | (24,125)
Valuation allowance | (84,065) | (40,588)
Net deferred tax liabilities, included in other liabilities | $ (253) | $ (251)

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