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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES - Variable Interest Entity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Risks and Uncertainties [Abstract] |  |  |
Assets | $ 868,131 | $ 789,088 | $ 703,741
Fixed assets | 56,899 | 63,703 |
Provision for income taxes (benefit) | $ (18,696) | 11,194 | $ 14,107
Employees |  |  |
Risks and Uncertainties [Abstract] |  |  |
Ownership percentage in VIE | 52.50% |  |
Variable Interest Entity, Primary Beneficiary |  |  |
Risks and Uncertainties [Abstract] |  |  |
Ownership percentage in VIE | 47.50% |  |
Assets | $ 4,800 |  |
Fixed assets | 3,400 |  |
Increase (decrease) in cost of sales | 800 | (400) |
Provision for income taxes (benefit) | $ (116) | $ (83) |

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