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INCOME TAXES - Reconciliation of Income Tax Uncertainties (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of the beginning and ending amount of income tax uncertainties |  |  |
Balance at the beginning of period | $ 3,647 | $ 3,559 | $ 3,080
Increases based on tax positions for the current year | 212 | 412 | 360
Increases based on tax positions of prior years | 790 | 663 | 610
Settlements | 0 | (558) | (491)
Lapse of statute of limitations | (145) | (429) | 0
Balance at the end of period | $ 4,504 | $ 3,647 | $ 3,559

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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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