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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of revenues from contracts with customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	$ 249,447	$ 298,221	$ 814,332	$ 825,559
Total revenues	199,305	363,268	637,222	1,151,943
Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	28,136	76,882	134,089	165,844
Total revenues	(24,690)	139,566	(49,513)	487,029
Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	47,375	49,002	146,222	143,696
Total revenues	50,059	51,365	152,714	148,895
Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	23,941	20,225	69,383	52,325
Total revenues	23,941	20,225	69,383	52,325
Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	67,559	83,793	229,134	255,668
Total revenues	67,559	83,793	229,134	255,668
Communications Segment | All Other
Revenue from External Customer [Line Items]
Total revenues	32,643	9,928	82,765	28,870
Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	49,793	58,391	152,739	179,156
Total revenues	49,793	58,391	152,739	179,156
All Other | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	32,643	9,928	82,765	28,870
Total revenues	32,643	9,928	82,765	28,870
Corporate finance, consulting and investment banking fees
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	45,257	87,654	180,943	189,630
Corporate finance, consulting and investment banking fees | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	21,316	67,429	111,560	137,305
Corporate finance, consulting and investment banking fees | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Corporate finance, consulting and investment banking fees | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	23,941	20,225	69,383	52,325
Corporate finance, consulting and investment banking fees | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Corporate finance, consulting and investment banking fees | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Corporate finance, consulting and investment banking fees | All Other | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Wealth and asset management fees
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	47,009	49,291	141,663	138,972
Wealth and asset management fees | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,252	1,958	3,677	3,880
Wealth and asset management fees | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	45,757	47,333	137,986	135,092
Wealth and asset management fees | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Wealth and asset management fees | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Wealth and asset management fees | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Wealth and asset management fees | All Other | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Commissions, fees and reimbursed expenses
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	7,186	9,164	27,088	33,263
Commissions, fees and reimbursed expenses | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	5,568	7,495	18,852	24,659
Commissions, fees and reimbursed expenses | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,618	1,669	8,236	8,604
Commissions, fees and reimbursed expenses | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Commissions, fees and reimbursed expenses | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Commissions, fees and reimbursed expenses | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Commissions, fees and reimbursed expenses | All Other | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Subscription services
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	65,041	80,713	221,168	245,903
Subscription services | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Subscription services | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Subscription services | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Subscription services | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	65,041	80,713	221,168	245,903
Subscription services | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Subscription services | All Other | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Service contract revenues
Revenue from External Customer [Line Items]
Total revenues from contracts with customers			0
Service contract revenues | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers			0
Service contract revenues | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers			0
Service contract revenues | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers			0
Service contract revenues | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers			0
Service contract revenues | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers			0
Service contract revenues | All Other | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers			0
Sale of goods
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	55,248	60,029	164,254	184,301
Total revenues	55,248	60,029	164,254	184,301
Sale of goods | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Sale of goods | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Sale of goods | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Sale of goods | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,318	1,638	4,079	5,145
Sale of goods | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	49,793	58,391	152,739	179,156
Sale of goods | All Other | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	4,137	0	7,436	0
Advertising and other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	29,706	11,370	79,216	33,490
Advertising and other | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Advertising and other | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Advertising and other | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Advertising and other | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,200	1,442	3,887	4,620
Advertising and other | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Advertising and other | All Other | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	28,506	9,928	75,329	28,870
Trading (loss) income
Revenue from External Customer [Line Items]
Revenue not from contract with customer	(1,238)	(9,727)	(50,226)	31,723
Trading (loss) income | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	(1,908)	(10,217)	(52,787)	29,488
Trading (loss) income | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	670	490	2,561	2,235
Trading (loss) income | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Trading (loss) income | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Trading (loss) income | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Trading (loss) income | All Other | All Other
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Fair value adjustments on loans
Revenue from External Customer [Line Items]
Revenue not from contract with customer	(71,477)	(860)	(259,260)	51,623
Total revenues	(71,477)	(860)	(259,260)	51,623
Fair value adjustments on loans | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	(71,477)	(860)	(259,260)	51,623
Total revenues	(71,477)	(860)	(259,260)	51,623
Fair value adjustments on loans | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Fair value adjustments on loans | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Fair value adjustments on loans | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Fair value adjustments on loans | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Fair value adjustments on loans | All Other | All Other
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Interest income - loans
Revenue from External Customer [Line Items]
Revenue not from contract with customer	11,251	27,397	51,894	102,535
Total revenues	11,251	27,397	51,894	102,535
Interest income - loans | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	11,251	27,397	51,894	102,535
Total revenues	11,251	27,397	51,894	102,535
Interest income - loans | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Interest income - loans | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Interest income - loans | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Interest income - loans | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Interest income - loans | All Other | All Other
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Interest income - securities lending
Revenue from External Customer [Line Items]
Revenue not from contract with customer	7,007	42,333	69,614	119,580
Total revenues	7,007	42,333	69,614	119,580
Interest income - securities lending | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	7,007	42,333	69,614	119,580
Total revenues	7,007	42,333	69,614	119,580
Interest income - securities lending | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Interest income - securities lending | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Interest income - securities lending | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Interest income - securities lending | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Interest income - securities lending | All Other | All Other
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Other
Revenue from External Customer [Line Items]
Revenue not from contract with customer	4,315	5,904	10,868	20,923
Other | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	2,301	4,031	6,937	17,959
Other | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	2,014	1,873	3,931	2,964
Other | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0		0	0
Other | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Other | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue not from contract with customer	0	0	0	0
Other | All Other | All Other
Revenue from External Customer [Line Items]
Revenue not from contract with customer	$ 0	$ 0	$ 0	$ 0

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