EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Number of Shares
Outstanding at beginning of period (in shares)	1,559,047
Forfeited (in shares)	(35)
Outstanding at end of period (in shares)	1,559,012	1,559,047
Exercisable at end of period (in shares)	1,559,012
Weighted- Average Exercise Price per Share
Outstanding at beginning of period (in dollars per share)	$ 11.60
Forfeited (in dollars per share)	10.09
Outstanding at end of period (in dollars per share)	11.60	$ 11.60
Exercisable at end of period (in dollars per share)	$ 11.60
Weighted- Average Remaining Contract Term
Outstanding	5 years 4 months 22 days	5 years 7 months 21 days
Forfeited	5 years 7 months 9 days
Exercisable at end of period	5 years 4 months 22 days
Aggregated Intrinsic Value
Outstanding	$ 14,183	$ 8,961
Exercisable at end of period	$ 14,183
Number of Shares
Outstanding at beginning of period (in shares)	8,069
Vested (in shares)	(8,034)
Forfeited (in shares)	(35)
Outstanding at end of period (in shares)	0	8,069
Weighted Average Grant Date Fair Value Per Share
Outstanding at beginning of period (in dollars per share)	$ 10.09
Vested (in dollars per share)	10.09
Forfeited (in dollars per share)	10.09
Outstanding at end of period (in dollars per share)	$ 10.09	$ 10.09