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STOCK PLANS (Non-Vested Stock Option Activity) (Details) - Stock options - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock Plans |  |  |
Balance of Nonvested Options (in shares) | 409,559 | 458,382 |
Options granted | 182,615 |  |
Vested (in shares) | (205,066) |  |
Forfeited (in shares) | (26,372) |  |
Nonvested stock options, Weighted Average Fair Value at Grant Date |  |  |
Balance at beginning of year, weighted average fair value at grant date (in dollars per share) | $ 14.32 |  |
Granted, weighted average fair value at grant date (in dollars per share) | 17.50 | $ 12.55 | $ 16.35
Vested, weighted average fair value at grant date (in dollars per share) | 14.82 |  |
Forfeited, weighted average fair value at grant date (in dollars per share) | 14.58 |  |
Balance at end of year, weighted average fair value at grant date (in dollars per share) | $ 15.47 | $ 14.32 |

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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=6415400&loc=d3e5070-113901 + Details
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