ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Components of Accrued expenses and other current liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Value added taxes payable	$ 34,522	$ 24,016
Deferred revenue	17,383	9,132
Contingent consideration, current (Note 4)	1,125	10,057
Other current liabilities and accrued expenses	26,660	39,271
Total	$ 79,690	$ 82,476