OTHER COMPREHENSIVE INCOME (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) Company	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
OTHER COMPREHENSIVE INCOME [Abstract]
Number of companies acquired | Company		4
Cumulative translation adjustment		$ (1,217)	$ (7,658)	$ (4,916)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Deferred tax asset on unrealized foreign currency losses				8,600
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Comprehensive income - deferred tax assets change in amount	$ (8,600)			$ 4,600	$ 2,700	$ 1,300