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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Shares      
Outstanding at beginning of year (in shares) 1,559,047 1,561,681 1,575,394
Granted (in shares) 0 0 2,973
Exercised (in shares) 0 0 0
Forfeited (in shares) (35) (2,634) (16,686)
Outstanding at end of year (in shares) 1,559,012 1,559,047 1,561,681
Exercisable at end of year (in shares) 1,559,012 1,550,978 1,535,718
Weighted-Average Exercise Price per Share      
Outstanding at beginning of year (in dollars per share) $ 11.60 $ 11.60 $ 11.58
Granted (in dollars per share) 0.00 0.00 12.27
Exercised (in dollars per share) 0.00 0.00 0.00
Forfeited (in dollars per share) 10.09 10.09 10.09
Outstanding at end of year (in dollars per share) 11.60 11.60 11.60
Exercisable at end of year (in dollars per share) $ 11.60 $ 11.61 $ 11.63
Number of Shares      
Outstanding at beginning of year (in shares) 8,069 25,963 147,589
Granted (in shares) 0 0 2,973
Vested (in shares) (8,034) (15,260) (107,913)
Forfeited (in shares) (35) (2,634) (16,686)
Outstanding at end of year (in shares) 0 8,069 25,963
Weighted-Average Price per Share      
Outstanding at beginning of year (in dollars per share) $ 10.09 $ 10.09 $ 10.09
Granted (in dollars per share) 0.00 0.00 12.27
Vested (in dollars per share) 10.09 10.09 10.15
Forfeited (in dollars per share) 10.09 10.09 10.09
Outstanding at end of year (in dollars per share) $ 0.00 $ 10.09 $ 10.09