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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of revenues from contracts with customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	$ 182,029	$ 197,227
Total revenues	352,060	186,063
Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues	23,728	30,108
Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	34,245	20,675
Total revenues	172,111	2,100
Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	31,620	40,848
Total revenues	52,175	47,278
Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	40,790	41,553
Total revenues	40,790	41,553
magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	8,783	9,801
Total revenues	8,783	9,801
Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	7,537	9,487
Total revenues	7,537	9,487
UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	2,821	3,633
Total revenues	2,821	3,633
Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	44,115	42,103
Total revenues	44,115	42,103
Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	12,118	29,127
Total revenues	23,728	30,108
Corporate finance, consulting and investment banking fees
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	27,459	17,729
Corporate finance, consulting and investment banking fees | Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	28,734	17,377
Corporate finance, consulting and investment banking fees | Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Corporate finance, consulting and investment banking fees | Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Corporate finance, consulting and investment banking fees | magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Corporate finance, consulting and investment banking fees | Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Corporate finance, consulting and investment banking fees | UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Corporate finance, consulting and investment banking fees | Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Corporate finance, consulting and investment banking fees | Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	(1,275)	352
Wealth and asset management fees
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	29,808	38,101
Wealth and asset management fees | Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Wealth and asset management fees | Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	28,219	37,229
Wealth and asset management fees | Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Wealth and asset management fees | magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Wealth and asset management fees | Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Wealth and asset management fees | UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Wealth and asset management fees | Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Wealth and asset management fees | Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,589	872
Commissions, fees and reimbursed expenses
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	8,947	6,974
Commissions, fees and reimbursed expenses | Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	5,511	3,298
Commissions, fees and reimbursed expenses | Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	3,401	3,619
Commissions, fees and reimbursed expenses | Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Commissions, fees and reimbursed expenses | magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Commissions, fees and reimbursed expenses | Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Commissions, fees and reimbursed expenses | UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Commissions, fees and reimbursed expenses | Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Commissions, fees and reimbursed expenses | Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	35	57
Subscription services
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	58,169	62,117
Subscription services | Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Subscription services | Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Subscription services | Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	40,790	41,553
Subscription services | magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	7,956	8,835
Subscription services | Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	7,026	8,541
Subscription services | UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	2,397	3,188
Subscription services | Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Subscription services | Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Sale of goods
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	45,367	47,455
Total revenues	45,367	47,455
Sale of goods | Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Sale of goods | Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Sale of goods | Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Sale of goods | magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	310	355
Sale of goods | Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	511	946
Sale of goods | UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Sale of goods | Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	44,115	42,103
Sale of goods | Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	431	4,051
Advertising and other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	12,279	24,851
Advertising and other | Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Advertising and other | Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Advertising and other | Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Advertising and other | magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	517	611
Advertising and other | Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Advertising and other | UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	424	445
Advertising and other | Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Advertising and other | Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	11,338	23,795
Trading gains (losses), net
Revenue from External Customer [Line Items]
Total revenues	145,061	(16,171)
Trading gains (losses), net | Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	135,303	(17,266)
Trading gains (losses), net | Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	10,096	612
Trading gains (losses), net | Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Trading gains (losses), net | magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Trading gains (losses), net | Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Trading gains (losses), net | UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Trading gains (losses), net | Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Trading gains (losses), net | Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues	(338)	483
Fair value adjustments on loans
Revenue from External Customer [Line Items]
Total revenues	6,545	(8,096)
Fair value adjustments on loans | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues	6,545	(4,965)
Fair value adjustments on loans | Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	(3,131)
Fair value adjustments on loans | Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Fair value adjustments on loans | Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Fair value adjustments on loans | magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Fair value adjustments on loans | Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Fair value adjustments on loans | UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Fair value adjustments on loans | Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Fair value adjustments on loans | Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues	6,545	(4,965)
Interest income - loans
Revenue from External Customer [Line Items]
Total revenues	1,714	3,196
Interest income - loans | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues	1,707	3,131
Interest income - loans | Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	7	65
Interest income - loans | Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - loans | Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - loans | magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - loans | Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - loans | UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - loans | Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - loans | Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues	1,707	3,131
Interest income - securities lending
Revenue from External Customer [Line Items]
Total revenues	1,251	840
Interest income - securities lending | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - securities lending | Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	1,251	840
Interest income - securities lending | Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - securities lending | Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - securities lending | magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - securities lending | Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - securities lending | UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - securities lending | Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Interest income - securities lending | Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues	0	0
Other
Revenue from External Customer [Line Items]
Total revenues	15,460	9,067
Other | Capital Markets | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	1,305	917
Other | Wealth Management | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	10,459	5,818
Other | Lingo | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Other | magicJack | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Other | Marconi Wireless | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Other | UOL | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Other | Consumer Products | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	0	0
Other | Corporate & All Other | Corporate & All Other
Revenue from External Customer [Line Items]
Total revenues	$ 3,696	$ 2,332

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