ACCUMULATED OTHER COMPREHENSIVE INCOME (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 109,491	$ 75,952	$ 58,743
Net current period other comprehensive loss	(54)	(308)	(220)
Balance	236,884	109,491	75,952
AOCI (Loss), Net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(165)	16	129
Net change in other comprehensive income (loss) before reclassification, net of tax	(41)	(158)	(113)
Amounts reclassified from accumulated other comprehensive income, net of tax	0	(23)	0
Net current period other comprehensive loss	(41)	(181)	(113)
Balance	$ (206)	$ (165)	$ 16