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STOCK-BASED COMPENSATION - Summary of Option Activity (Details) - Options - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Stock Awards Plans |  |
Stock options activity |  |
Outstanding at the beginning of the period (in shares) | 3,072,503 |
Exercised (in shares) | (168,846) |
Forfeited or expired (in shares) | (400) |
Outstanding at the end of the period (in shares) | 2,903,257 |
Stock option weighted average exercise price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 71.99 |
Options exercised, Weighted average exercise price per share (in dollars per share) | 67.60 |
Options forfeited or expired, Weighted average exercise price per share (in dollars per share) | 51.80 |
Outstanding at the end of the period (in dollars per share) | $ 72.25 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |
Options exercisable, Number of options (in shares) | 2,903,257 |
Options exercisable, Weighted average exercise price per share (in dollars per share) | $ 72.25 |
Options outstanding, Weighted average remaining contractual term (in years) | 3 years 7 months 6 days |
Options exercisable, Weighted average remaining contractual term (in years) | 3 years 7 months 6 days |
Options outstanding, Aggregate intrinsic value (in USD) | $ 90,420 |
Options exercisable, Aggregate intrinsic value (in USD) | 90,420 |
Options exercised, Intrinsic value, at end of period | $ 8,046 | $ 63,407
Director Stock Option Plans |  |
Stock options activity |  |
Outstanding at the beginning of the period (in shares) | 51,700 |
Exercised (in shares) | 0 |
Forfeited or expired (in shares) | 0 |
Outstanding at the end of the period (in shares) | 51,700 |
Stock option weighted average exercise price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 63.91 |
Options exercised, Weighted average exercise price per share (in dollars per share) | 0 |
Options forfeited or expired, Weighted average exercise price per share (in dollars per share) | 0 |
Outstanding at the end of the period (in dollars per share) | $ 63.91 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |
Options exercisable, Number of options (in shares) | 51,700 |
Options exercisable, Weighted average exercise price per share (in dollars per share) | $ 63.91 |
Options outstanding, Weighted average remaining contractual term (in years) | 1 year 7 months 6 days |
Options exercisable, Weighted average remaining contractual term (in years) | 1 year 7 months 6 days |
Options outstanding, Aggregate intrinsic value (in USD) | $ 2,041 |
Options exercisable, Aggregate intrinsic value (in USD) | 2,041 |
Options exercised, Intrinsic value, at end of period | $ 0 | $ 4,248

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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