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STOCK PLANS (Non-Vested Stock Option Activity) (Details) (Stock options, USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stock options |  |  |
Nonvested stock options, Number of Options |  |  |
Balance at beginning of year (in shares) | 929,382 |  |
Granted (in shares) | 412,980 | 459,263 | 491,010
Vested (in shares) | (470,243) |  |
Forfeited (in shares) | (19,630) |  |
Balance at end of year (in shares) | 852,489 | 929,382 |
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) | $ 10.78 |  |
Granted, weighted average fair value at grant date (in dollars per share) | $ 15.87 |  |
Vested, weighted average fair value at grant date (in dollars per share) | $ 10.19 |  |
Forfeited, weighted average fair value at grant date (in dollars per share) | $ 19.60 |  |
Balance at end of year, weighted average fair value at grant date (in dollars per share) | $ 13.63 | $ 10.78 |

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- Definition The number of shares under options that were forfeited during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of unvested 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. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of nonvested options granted during the reporting period. + References No definition available. + Details
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- Definition The number of non-vested stock options that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition The weighted average grant date fair value of nonvested options that are outstanding as of the balance-sheet date under the stock option plans. + References No definition available. + Details
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- Definition The number of stock options that vested during the reporting period. + References No definition available. + Details
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- Definition The weighted average fair value as of grant date pertaining to a stock option award for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with terms of the arrangement. + References No definition available. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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