REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Transaction-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 959,733	$ 758,101
Subscription and services-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	525,065	255,883
Revenues from other sources	32,616	40,352
Hardware revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	28,788	20,675
Bitcoin revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,511,068	$ 306,098