ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Summary of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balance at the beginning of the period	$ (6,786)	$ (7,889)
Other comprehensive income (loss) before reclassifications	(1,084)	(261)
Loss reclassified from accumulated other comprehensive loss to net income (loss)	905	1,364
Other comprehensive income (loss)	(179)	1,103	$ (177)
Balance at the end of the period	$ (6,965)	$ (6,786)	$ (7,889)