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INCOME TAXES (Details - Deferred Income Taxes - Components) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Provision for accrued expenses | $ 4,907 | $ 12,234 |  |
Leasing | 24,864 | 7,299 |  |
Net operating loss carryforwards | 56,190 | 56,450 |  |
Non-cash compensation expense | 20,746 | 15,805 |  |
Intangible assets | 12,684 | 4,182 |  |
Interest limitation | 4,059 | 987 |  |
Contingent liabilities | 4,507 | 9,366 |  |
Tax credits | 13,656 | 6,124 |  |
Other | 3,605 | 446 |  |
Total gross deferred tax assets | 145,218 | 112,893 |  |
Less: valuation allowance | (5,802) | (4,102) | $ (2,229) | $ (2,694)
Total deferred tax assets, net of the valuation allowance | 139,416 | 108,791 |  |
Deferred tax liabilities: |  |  |  |
Leasing | (21,632) | (6,596) |  |
Property and equipment | (5,015) | (4,748) |  |
Other | (653) | (1,835) |  |
Total gross deferred tax liabilities | (27,300) | (13,179) |  |
Net deferred taxes | 112,116 | $ 95,612 |  |
Federal |  |  |  |
Deferred tax liabilities: |  |  |  |
Operating loss carryforwards | 179,500 |  |  |
State |  |  |  |
Deferred tax liabilities: |  |  |  |
State operating loss carryforwards | $ 519,500 |  |  |

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