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Related Party Balances and Transactions (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets:    
Trade receivables, net $ 20,381 $ 20,266
Other accounts receivable and prepaid expenses 1,766 2,685
Liabilities:    
Other accounts payables and accrued expenses 2,281 3,428
Related Parties [Member]    
Assets:    
Trade receivables, net 13,596 14,329
Other accounts receivable and prepaid expenses 2
Liabilities:    
Trade payables 81 63
Other accounts payables and accrued expenses $ 12 $ 140