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SHARE-BASED COMPENSATION PLANS - Non-vested stock options (Details) - Non Vested Stock Options [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Options, Outstanding at beginning of year | 473,740 | 481,613
Number of Options, Granted | 188,600 | 192,650
Number of Options, Vested | (165,824) | (193,838)
Number of Options, Forfeited | (11,145) | (6,685)
Number of Options, Outstanding at end of year | 485,371 | 473,740
Weighted Average Exercise Price, Outstanding at beginning of year (in dollars per share) | $ 27.77 | $ 29.46
Weighted Average Exercise Price, Granted (in dollars per share) | 18.00 | 23.45
Weighted Average Exercise Price, Vested (in dollars per share) | 27.48 | 27.59
Weighted Average Exercise Price, Forfeited (in dollars per share) | 27.54 | 29.94
Weighted Average Exercise Price, Outstanding at end of year (in dollars per share) | 24.08 | 27.77
Weighted Average Fair Value, Outstanding at beginning of year (in dollars per share) | 4.26 | 4.49
Weighted Average Fair Value, Granted (in dollars per share) | 2.01 | 3.32
Weighted Average Fair Value, Vested (in dollars per share) | 3.99 | 3.87
Weighted Average Fair Value, Forfeited (in dollars per share) | 4.27 | 4.87
Weighted Average Fair Value, Outstanding at end of the year (in dollars per share) | $ 3.48 | $ 4.26

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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- Definition Weighted average exercise price of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the non-vested stock option plan. + References No definition available. + Details
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- Details
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