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INCOME TAXES - Valuation Allowances (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | $ 46,702 | $ 76,206
Capital loss carryforwards | 200 |
Interest expense limitation carryforwards | 30,500 |
Federal net operating loss carry forwards, have no expiration period | 8,000 |
Income Tax Holiday, Aggregate Dollar Amount | $ 13,000 | $ 4,000
Income Tax Holiday, Income Tax Benefits Per Share | $ 0.34 | $ 0.12
Decrease in valuation allowance | $ 29,500 |
Undistributed earnings of foreign subsidiaries | 58,900 |
Domestic Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | 4,200 |
Operating Loss Carryforwards | 70,300 | $ 70,300
Tax Credit Carryforward, Amount | 1,300 |
Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | 42,500 |
Operating Loss Carryforwards | 129,600 |
State Taxing Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | 117,700 |
Tax Credit Carryforward, Amount | $ 1,700 |

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