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EMPLOYEE STOCK COMPENSATION - Option Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Outstanding at beginning of year (in shares) 210,973 968,591 960,879
Granted (in shares) 0 0 320,000
Cash settled (in shares) 0 0 55,826
Exercised (in shares) (24,000) (488,281) (51,666)
Forfeited (in shares) 0 (269,337) (202,743)
Expired (in shares) 0 0 (2,053)
Outstanding at end of year (in shares) 186,973 210,973 968,591
Exercisable at end of year (in shares) 123,125 105,541 449,655
Weighted-Average Exercise Price per Share      
Outstanding at beginning of year (in dollars per share) $ 13.99 $ 13.95 $ 12.86
Granted (in dollars per share) 0.00 0.00 16.78
Cash settled (in dollars per share) 0.00 0.00 14.33
Exercised (in dollars per share) 17.50 12.53 11.48
Forfeited (in dollars per share) 0.00 16.49 13.84
Expired (in dollars per share) 0.00 0.00 13.88
Outstanding at end of year (in dollars per share) 13.54 13.99 13.95
Exercisable at end of year (in dollars per share) $ 13.67 $ 14.68 $ 12.68