OTHER INCOME, NET Components of Other Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Interest and investment income	$ 140	$ 147
Income tax benefit	65	163
Other non-operating income	4	0
Total other income (expense), net	$ 209	$ 310