OTHER INCOME, NET Components of Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Income and Expenses [Abstract]
Interest and investment income	$ 23	$ 113	$ 163	$ 260
Income tax (expense) benefit	(171)	79	(106)	242
Other non-operating income	0	0	4	0
Total other income (expense), net	$ (148)	$ 192	$ 61	$ 502