SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Stock-Based Compensation) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	$ 21,826	$ 18,112	$ 41,871	$ 35,959
Cost of revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	3,522	2,991	6,905	5,961
Selling and marketing (excluding customer base amortization)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	2,375	1,985	4,589	3,648
Software development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	4,335	2,998	8,361	6,104
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	$ 11,594	$ 10,138	$ 22,016	$ 20,246