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INCOME TAXES - Reconciliation of Tax Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |
Balance at beginning of period | $ 13,009 | $ 13,162 | $ 15,990
Additions based on tax positions taken during a prior period | 219 | 484 | 94
Reductions based on tax positions taken during a prior period |  | (4,295) | (153)
Reductions related to a lapse of applicable statute of limitations | (3,555) | (821) | (3,144)
Reductions related to a settlement with taxing authorities |  |  | (382)
Balance at end of period | $ 9,673 | 13,009 | 13,162
Acquisitions [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Additions based on tax positions taken during a prior period |  | $ 4,479 | $ 757

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