REVENUES, Revenues from Contract with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Wire transfer and money order fees	$ 99,671	$ 72,965	$ 180,887	$ 140,281
Discounts and promotions	(365)	(172)	(669)	(393)
Revenues	116,747	85,062	211,323	162,313
Wire transfer and money order fees, net
Disaggregation of Revenue [Line Items]
Revenues	99,306	72,793	180,218	139,888
Foreign exchange gain, net
Disaggregation of Revenue [Line Items]
Revenues	16,655	11,660	29,703	21,214
Other income
Disaggregation of Revenue [Line Items]
Revenues	$ 786	$ 609	$ 1,402	$ 1,211