INCOME TAXES - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 10	$ 37	$ 81
State and local	777	904	408
Deferred:
Federal	232	(1,918)	(159)
State and local	49	(473)	223
Effect of federal tax law change	606	0	0
Income tax expense (benefit)	$ 1,674	$ (1,450)	$ 553