OTHER (EXPENSE) INCOME, NET Components of Other (Expense) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Interest and investment income	$ 46	$ 111	$ 209	$ 371
Income tax (expense) benefit	(171)	(210)	(277)	32
Other non-operating income	0	0	4	0
Total other (expense) income, net	$ (125)	$ (99)	$ (64)	$ 403