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EMPLOYEE BENEFITS - Summary of RSU and Share Transactions (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restricted Stock Units (RSUs) |  |  |
Units |  |  |
Beginning balance (in shares) | 674,218 |  |
Granted (in shares) | 165,930 |  |
Shares issued (in shares) | (223,484) |  |
Forfeited (in shares) | (22,041) |  |
Ending balance (in shares) | 594,623 | 674,218 |
Weighted Average Grant-Date Fair Value |  |  |
Beginning balance (in dollars per share) | $ 63.42 |  |
Granted (in dollars per share) | 81.89 | $ 88.23 | $ 67.91
Shares issued (in dollars per share) | 69.03 |  |
Forfeited (in dollars per share) | 83.86 |  |
Ending balance (in dollars per share) | $ 65.70 | $ 63.42 |
Performance Shares |  |  |
Units |  |  |
Beginning balance (in shares) | 447,805 |  |
Granted (in shares) | 286,645 |  |
Shares issued (in shares) | (256,914) |  |
Forfeited (in shares) | (13,029) |  |
Ending balance (in shares) | 464,507 | 447,805 |
Weighted Average Grant-Date Fair Value |  |  |
Beginning balance (in dollars per share) | $ 69.93 |  |
Granted (in dollars per share) | 76.08 | $ 75.36 | $ 68.33
Shares issued (in dollars per share) | 56.88 |  |
Forfeited (in dollars per share) | 84.28 |  |
Ending balance (in dollars per share) | $ 80.54 | $ 69.93 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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