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ACCOUNTING POLICIES ACCOUNTING POLICIES - Summary of Equity Investment Ownerships (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]
Revenue, net	$ 351,573,000	$ 367,729,000
Bitt Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	21.00%
Spera, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	19.00%
SettleMint NV [Member] [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	29.00%
Voatz, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
Chainstone Labs
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	29.00%
Finclusive [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	10.00%
Minds, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	24.00%
VinX Network Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	29.00%
GrainChain, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	18.00%
Medici Land Governance [Member] [Domain]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	35.00%
Boston Security Token Exchange LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
MVI [Member]
Schedule of Equity Method Investments [Line Items]
Revenue, net	$ 1,574,000	$ 608,000