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INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets: |  |  |
Doubtful accounts | $ 2,426 | $ 1,507 |
Inventory related items | 39,548 | 28,245 |
Tax credits | 19,134 | 9,072 |
Accrued vacation | 3,206 | 2,761 |
Accrued bonus | 6,017 | 5,515 |
Stock compensation | 8,347 | 10,093 |
Deferred revenue | 1,805 | 2,173 |
Net operating loss carryforwards | 37,418 | 33,350 |
Capitalization of research and development expenses | 9,781 | 0 |
Unrealized foreign exchange loss | 8,105 | 1,405 |
Charitable contributions carryforward | 235 | 1,994 |
Others | 5,900 | 8,835 |
Total deferred tax assets | 141,922 | 104,950 | $ 96,500
Less valuation allowance | (9,865) | (6,973) | $ (8,000)
Deferred tax assets after valuation allowance | 132,057 | 97,977 |
Liabilities: |  |  |
Intangible and fixed assets | (150,879) | (144,861) |
Others | (5,108) | (4,089) |
Total deferred tax liabilities | (155,987) | (148,950) |
Total net deferred tax liabilities | $ (23,930) | $ (50,973) |

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