ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Components of Accrued expenses and other current liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Value added taxes payable	$ 24,016	$ 19,985
Contingent consideration, current (Note 11)	10,057	1,501
Deferred revenue	9,132	4,558
Other current liabilities and accrued expenses	39,271	24,209
Total	$ 82,476	$ 50,253