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STOCK-BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Grants in period, net of forfeitures (in shares) | shares | 149,558
Options, weighted average grant date fair value (in dollars per share) | $ / shares | $ 22.59
Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total unrecognized compensation costs | $ | $ 3.7
Weighted-average period for cost recognition | 2 years
Stock Options | Directors |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock options exercisable, vesting period | 1 year
Stock Options | Employees |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Expiration period | 8 years
Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock options exercisable, vesting period | 3 years
Total unrecognized compensation costs | $ | $ 26.8
Weighted-average period for cost recognition | 2 years
Awards granted during the period (in shares) | shares | 258,265
Other than options, weighted average grant date fair value (in dollars per share) | $ / shares | $ 68.41
Performance Stock and Restricted Stock Awards |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Requisite service periods of awards | 3 years
Performance Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards granted during the period (in shares) | shares | 176,147
Other than options, weighted average grant date fair value (in dollars per share) | $ / shares | $ 68.10
Minimum | Stock Options | Directors and Certain Executive Officers |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Expiration period | 6 years
Maximum | Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock options exercisable, vesting period | 4 years
Maximum | Stock Options | Directors and Certain Executive Officers |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Expiration period | 10 years

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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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