SEGMENTS INFORMATION (Revenues by Customer Location) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 651,359	$ 521,333
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	370,089	299,680
United Kingdom
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	92,132	65,739
Switzerland
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	47,222	36,233
Netherlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	25,909	20,616
Russia
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	21,961	15,892
Germany
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	20,193	19,154
Canada
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	17,920	16,972
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 55,933	$ 47,047