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EMPLOYEE STOCK COMPENSATION - Nonvested Stock Option Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Number of Shares |  |  |
Outstanding at beginning of year (in shares) | 518,936 | 566,266 | 552,672
Granted (in shares) | 0 | 320,000 | 193,696
Vested (in shares) | (174,833) | (170,837) | (170,102)
Forfeited (in shares) | (238,671) | (196,493) | (10,000)
Outstanding at end of year (in shares) | 105,432 | 518,936 | 566,266
Weighted-Average Exercise Price per Share |  |  |
Outstanding at beginning of year (in dollars per share) | $ 15.04 | $ 12.99 | $ 12.74
Granted (in dollars per share) | 0.00 | 16.77 | 13.28
Vested (in dollars per share) | 14.10 | 12.81 | 12.57
Forfeited (in dollars per share) | 16.50 | 13.86 | 12.03
Outstanding at end of year (in dollars per share) | $ 13.31 | $ 15.04 | $ 12.99

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Forfeited in Period, Weighted Average Exercise Price + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Grants in Period, Weighted Average Exercise Price + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Vested in Period, Weighted Average Exercise Price + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Exercise Price + 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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