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INCOME TAXES - Components of Income Tax - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating loss carryforwards |  |  |
Effective tax rate (as a percent) | 858.30% | 67.60% |
Income Tax Benefit, Utilization of Losses at Higher Rate, Coronavirus Aid, Relief, and Economic Security Act | $ 3,100 |  |
Increase unrecognized tax benefits | 2,100 | $ 3,900 |
Net increase for permanently non-deductible expenses | 1,500 | 3,800 |
Income tax benefit from investment tax credit |  | 1,200 |
Loss on sale of Vibrant with no tax benefit | 21,500 |  |
Operating loss carryforward that will expire | 57,300 |  |
Operating loss carryforward with no expiration | 73,600 |  |
Valuation allowance | 31,014 | 39,406 |
Undistributed earnings of foreign subsidiaries | 145,100 |  |
Unrecognized benefits, including interest and penalties | 40,800 | 38,600 | $ 34,700
Increase from prior period positions | 2,100 |  |
Increase in unrecognized tax benefits taken during the current period | 2,964 | $ 3,383 | $ 3,408
Settlement of prior year positions | 2,900 |  |
Federal |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | 1,100 |  |
State |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | 18,900 |  |
Foreign |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | $ 110,900 |  |

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