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EMPLOYEE STOCK COMPENSATION - 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) 968,591 960,879 879,070
Granted (in shares) 0 320,000 193,696
Cash settled (in shares) 0 55,826 0
Exercised (in shares) (488,281) (51,666) (43,333)
Forfeited (in shares) (269,337) (202,743) (68,554)
Expired (in shares) 0 (2,053) 0
Outstanding at end of year (in shares) 210,973 968,591 960,879
Exercisable at end of year (in shares) 105,541 449,655 394,613
Weighted-Average Exercise Price per Share      
Outstanding at beginning of year (in dollars per share) $ 13.95 $ 12.86 $ 12.67
Granted (in dollars per share) 0.00 16.78 13.28
Cash settled (in dollars per share) 0.00 14.33 0.00
Exercised (in dollars per share) 12.53 11.48 11.55
Forfeited (in dollars per share) 16.49 13.84 12.38
Expired (in dollars per share) 0.00 13.88 0.00
Outstanding at end of year (in dollars per share) 13.99 13.95 12.86
Exercisable at end of year (in dollars per share) $ 14.68 $ 12.68 $ 12.70