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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 | $ 851,861 | $ 788,220 |
Fixed assets | 56,899 | 63,703 |
Income tax benefit | $ 18,441 | (10,894) | $ (13,185)
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) |
Income tax benefit | $ 116 | $ 83 |

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