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INCOME TAXES - Reconciliation of Beginning and Ending Balances of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at beginning of period | $ 18,157 | $ 19,150 | $ 22,671
Additions based on tax positions related to the current year | 510 | 978 | 452
Additions for tax positions of prior years | 4,917 | 174 | 238
Additions for acquired uncertain tax benefits | 0 | 0 | 0
Reductions for change in U.S. federal tax rate | 0 | 0 | (2,424)
Reductions for tax positions of prior years | (313) | (2,145) | (1,500)
Reductions for a lapse of the applicable statute of limitations | 0 | 0 | (287)
Balance at end of period | $ 23,271 | $ 18,157 | $ 19,150

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from acquisitions. + References No definition available. + Details
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