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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Schedule of Other Receivables and Prepaid Expenses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Prepaid Expense and Other Assets [Abstract]    
Government authorities $ 26,275 $ 23,312
Interest receivable 2,042 804
Prepaid expenses 26,688 24,863
Inventories 9,013 4,716
Prepaid expenses and other current assets of discontinued operations 2,042 3,734
Other 4,014 4,271
Prepaid expenses and other current assets $ 70,074 $ 61,700