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EMPLOYEE STOCK COMPENSATION - Nonvested Stock Option Activity (Details) - $ / shares
 12 Months Ended
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