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SHARE-BASED COMPENSATION PLANS (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share Options |  |  |  |
Assumptions used for estimating the fair value of share options |  |  |  |
Risk-free interest rate (as a percent) |  | 1.50% | 0.60% | 1.90%
Expected dividend yield (as a percent) |  | 3.70% | 3.80% | 3.90%
Volatility (as a percent) |  | 25.00% | 25.00% | 20.00%
Weighted average expected life of the options |  | 6 years | 6 years | 6 years
Weighted average grant date fair value of options granted per share (in dollars per share) |  | $ 8.83 | $ 4.62 | $ 3.66
Term |  | 10 years | 10 years | 10 years
Share options, additional general disclosures |  |  |  |
Compensation expense recognized (in dollars) |  | $ 2,500,000 | $ 2,300,000 | $ 2,000,000.0
Vesting period |  | 3 years |  |
Unrecognized compensation cost |  | $ 2,800,000 |  |
Unrecognized compensation cost recorded, period |  | 1 year 8 months 12 days |  |
Number of Shares Under Option |  |  |  |
Balance at the beginning of the period (in shares) |  | 2,263,804 |  |
Options granted (in shares) |  | 324,840 |  |
Options exercised (in shares) |  | (51,606) |  |
Balance at the end of the period (in shares) |  | 2,537,038 | 2,263,804 |
Vested or expected to vest at the end of the period (in shares) |  | 2,537,038 |  |
Exercisable at the end of the period (in shares) |  | 1,636,544 |  |
Weighted Average Exercise Price |  |  |  |
Balance at the beginning of the period (in dollars per share) |  | $ 29.63 |  |
Options granted (in dollars per share) |  | 56.91 |  |
Options exercised (in dollars per share) |  | 30.80 |  |
Balance at the end of the period (in dollars per share) |  | 33.10 | $ 29.63 |
Vested or expected to vest at the end of the period (in dollars per share) |  | 33.10 |  |
Exercisable at the end of the period (in dollars per share) |  | $ 28.42 |  |
Weighted Average Remaining Contractual Term |  |  |  |
Balance at the end of the period |  | 6 years 2 months 15 days | 6 years 9 months 25 days |
Options granted |  | 9 years 3 days |  |
Options exercised |  | 7 years 3 months 14 days |  |
Vested or expected to vest at the end of the period |  | 6 years 2 months 15 days |  |
Exercisable at the end of the period |  | 5 years 1 month 20 days |  |
Aggregate intrinsic value |  |  |  |
Options, exercisable (in dollars) |  | $ 19,400,000 |  |
Options, vested or expected to vest and exercisable (in dollars) |  | 23,600,000 |  |
Options exercised (in dollars) |  | $ 1,000,000.0 | $ 10,600,000 | $ 900,000
Restricted Shares | Minimum |  |  |  |
Share options, additional general disclosures |  |  |  |
Vesting period |  | 3 years |  |
Restricted Shares | Maximum |  |  |  |
Share options, additional general disclosures |  |  |  |
Vesting period |  | 5 years |  |
Performance Shares |  |  |  |
Assumptions used for estimating the fair value of share options |  |  |  |
Term |  | 3 years |  |
Restricted Stock and Performance Shares |  |  |  |
Assumptions used for estimating the fair value of share options |  |  |  |
Risk-free interest rate (as a percent) |  | 1.00% | 0.20% | 1.70%
Volatility (as a percent) |  | 28.00% | 28.00% | 19.00%
Share options, additional general disclosures |  |  |  |
Compensation expense recognized (in dollars) |  | $ 6,500,000 | $ 5,800,000 | $ 5,200,000
Unrecognized compensation cost |  | $ 7,600,000 |  |
Unrecognized compensation cost recorded, period |  | 2 years |  |
Number of Non-Vested Restricted Shares |  |  |  |
Non-vested at the beginning of the period (in shares) |  | 387,701 |  |
Granted (in shares) |  | 126,304 |  |
Vested (in shares) |  | (164,228) |  |
Forfeited (in shares) |  | (8,825) |  |
Non-vested at the end of the period (in shares) |  | 340,952 | 387,701 |
Restricted Shares & Performance Units |  |  |  |
Weighted average fair value of restricted shares and performance units granted |  | $ 61.41 | $ 39.37 | $ 32.39
Total fair value of restricted shares and performance units vested |  | $ 5.6 | $ 4.8 | $ 6.0
Plan |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |
Additional shares authorized | 4,500,000 |  |  |
Shares reserved for future issuance | 991,117 |  |  |
Shares available for future awards |  | 1,941,786 |  |
Percentage of shares that may not be subject to specific limitations |  | 5.00% |  |
Maximum term of options |  | 10 years |  |
Plan | Minimum |  |  |  |
Share options, additional general disclosures |  |  |  |
Vesting period |  | 1 year |  |
Plan | Share Options |  |  |  |
Number of Shares Under Option |  |  |  |
Balance at the end of the period (in shares) |  | 2,537,038 |  |
Plan | Restricted Shares |  |  |  |
Number of Non-Vested Restricted Shares |  |  |  |
Non-vested at the end of the period (in shares) |  | 340,952 |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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