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INCOME TAXES - Components of Income Tax - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating loss carryforwards |  |  |
Effective tax rate (as a percent) | 67.60% | 35.10% |
Increase unrecognized tax benefits | $ 3,900 | $ 10,600 |
Net increase for permanently non-deductible expenses | 3,800 |  |
Income tax benefit from investment tax credit | 1,215 |  |
Benefit (net) to record a return to accrual adjustment |  | 4,700 |
Benefit to recognize a capital loss carryover due to capital gains |  | 1,200 |
Benefit (net) to record the change in valuation allowance |  | 1,400 |
Provision for the intercompany sale of assets |  | 1,700 |
Operating loss carryforward that will expire | 81,300 |  |
Operating loss carryforward with no expiration | 92,300 |  |
Valuation allowance | 39,406 | 31,442 |
Undistributed earnings of foreign subsidiaries | 129,000 |  |
Unrecognized benefits, including interest and penalties | 38,600 | 34,700 | $ 24,100
Increase from prior period positions | 2,000 |  |
Increase in unrecognized tax benefits taken during the current period | 3,383 | $ 3,408 | $ 3,394
Settlement of prior year positions | 1,500 |  |
Federal |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | 7,300 |  |
State |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | 6,100 |  |
Foreign |  |  |
Operating loss carryforwards |  |  |
Operating loss carryforwards | $ 160,200 |  |

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