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INCOME TAXES - Reconciliation of Income Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
U.S. federal statutory rate | 21.00% | 21.00% | 21.00%
State taxes | 0.30% | 2.60% | 0.80%
Foreign | 3.30% | 4.40% | (0.40%)
Research and development credit | (0.80%) | (1.30%) | (1.70%)
U.S. net operating loss carryback | (3.40%) | 0.00% | 0.00%
Changes in valuation allowance | 3.00% | (2.00%) | 3.50%
U.S. tax reform provision | 0.70% | 1.30% | 2.00%
Transaction costs related to acquisitions | 0.10% | 0.00% | 1.00%
Other, net | (1.00%) | 0.00% | 0.70%
Effective rate | 23.20% | 26.00% | 26.90%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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