OTHER (EXPENSE) INCOME, NET Components of Other (Expense) Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Income and Expenses [Abstract]
Interest and investment income	$ 156	$ 23	$ 163	$ 163
Income tax expense	(206)	(171)	(442)	(106)
Other non-operating income	0	0	0	4
Total other (expense) income, net	$ (50)	$ (148)	$ (279)	$ 61