SIGNIFICANT ACCOUNTING POLICIES (Concentrations of Credit risks) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Accrued allowance for doubtful accounts	$ 427	$ 128	$ 226
Rebate accrual	39,018	17,428	9,089
Net unrealized loss	$ 875	$ 590	$ 223