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STOCK-BASED COMPENSATION PLANS (Details 2) - Non Vested Stock Options [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Options, Outstanding at beginning of year | 724,125 | 756,920 | 751,582
Number of Options, Granted | 211,200 | 277,800 | 299,700
Number of Options, Vested | (296,638) | (293,720) | (275,187)
Number of Options, Forfeited | (13,325) | (16,875) | (19,175)
Number of Options, Outstanding at end of year | 625,362 | 724,125 | 756,920
Weighted Average Exercise Price, Outstanding at beginning of year (in dollars per share) | $ 26.2 | $ 26.53 | $ 26.74
Weighted Average Exercise Price, Granted (in dollars per share) | 27.94 | 25.51 | 25.64
Weighted Average Exercise Price, Vested (in dollars per share) | 26.71 | 26.39 | 26.14
Weighted Average Exercise Price, Forfeited (in dollars per share) | 26.16 | 26.37 | 26.59
Weighted Average Exercise Price, Outstanding at end of year (in dollars per share) | 26.55 | 26.2 | 26.53
Weighted Average Fair Value, Outstanding at beginning of year (in dollars per share) | 3.07 | 3.1 | 3.12
Weighted Average Fair Value, Granted (in dollars per share) | 4.05 | 3.05 | 3.3
Weighted Average Fair Value, Vested (in dollars per share) | 3.01 | 3.13 | 3.36
Weighted Average Fair Value, Forfeited (in dollars per share) | 3.12 | 3.1 | 3.14
Weighted Average Fair Value, Outstanding at end of the year (in dollars per share) | $ 3.43 | $ 3.07 | $ 3.1

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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 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 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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