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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award |  |
Proceeds from stock option exercises | $ 53,979 | $ 51,098
Time-Based RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (in years) | 3 years |
RSU's granted (in shares) | 143,807 |
RSU's vested (in shares) | 220,723 |
Time-Based RSUs | Director Stock Option Plans |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
RSU's granted (in shares) | 10,007 |
RSU's vested (in shares) | 12,379 |
Performance-Based RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (in years) | 3 years |
RSU's granted (in shares) | 169,974 |
RSU's vested (in shares) | 72,139 |
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Tax benefit | $ 5,500 |
Unrecognized compensation expense | $ 50,900 |
Weighted-average period cost will be recognized over | 1 year 10 months 24 days |
Restricted Stock Units | Director Stock Option Plans |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (in years) | 1 year |
Options |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (in years) | 3 years |
Tax benefit | $ 15,400 | $ 10,800
Expiration period (in years) | 10 years |
Proceeds from stock option exercises | $ 54,000 |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of tax benefit from exercise of option under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 + Details
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