INCOME TAXES, JOBS Tax Act (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018		Mar. 31, 2017	[1]	Mar. 31, 2016	[1]
INCOME TAXES [Abstract]
Federal rate change	$ 500	$ 2,900	$ 3,539	[1]	$ 0		$ 0
Income tax provision, one time non-cash charge			$ 3,400

[1] The federal rate change is due to the impact of the Tax Act.