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INCOME TAXES - Income Tax Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of beginning and ending amount of unrecognized tax benefits, excluding interest |  |  |
Balance at beginning of period | $ 53,324 | $ 35,679 | $ 25,063
Additions based on tax positions related to the current year | 7,818 | 11,221 | 8,589
Additions for tax positions of prior years | 1,772 | 7,599 | 3,901
Reductions for tax positions of prior years | (16,512) | (283) | (134)
Expiration of applicable statute of limitations | (778) | (892) | (1,740)
Balance at end of period | $ 45,624 | $ 53,324 | $ 35,679

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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=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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