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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of revenues from contracts with customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	$ 1,288,605	$ 962,152	$ 1,179,369
Interest income - Loans and securities lending	284,896	245,400	122,723
Total revenues	1,643,600	1,080,670	1,554,698
Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	226,976	223,818	539,398
Total revenues	571,002	327,596	891,230
Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	187,276	224,104	358,487
Total revenues	198,245	234,257	381,984
Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	103,265	69,509	73,517
Total revenues	103,265	74,096	73,517
Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	133,705	98,508	94,312
Total revenues	133,705	98,508	94,312
Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	337,689	235,655	93,347
Total revenues	337,689	235,655	93,347
Consumer Products Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	233,202	77,821
Total revenues	233,202	77,821
All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	66,492	32,737	20,308
Total revenues	66,492	32,737	20,308
Corporate finance, consulting and investment banking fees
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	273,525	228,098	540,686
Corporate finance, consulting and investment banking fees | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	190,480	169,955	484,247
Corporate finance, consulting and investment banking fees | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Corporate finance, consulting and investment banking fees | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Corporate finance, consulting and investment banking fees | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	83,045	58,143	56,439
Corporate finance, consulting and investment banking fees | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Corporate finance, consulting and investment banking fees | Consumer Products Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0
Corporate finance, consulting and investment banking fees | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Wealth and asset management fees
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	181,343	217,352	289,480
Wealth and asset management fees | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	4,060	12,547	6,769
Wealth and asset management fees | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	177,283	204,805	282,711
Wealth and asset management fees | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Wealth and asset management fees | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Wealth and asset management fees | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Wealth and asset management fees | Consumer Products Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0
Wealth and asset management fees | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Commissions, fees and reimbursed expenses
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	122,151	113,561	181,110
Commissions, fees and reimbursed expenses | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	32,436	41,316	48,382
Commissions, fees and reimbursed expenses | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	9,993	19,299	75,776
Commissions, fees and reimbursed expenses | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	29,062	12,581	19,079
Commissions, fees and reimbursed expenses | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	50,660	40,365	37,873
Commissions, fees and reimbursed expenses | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Commissions, fees and reimbursed expenses | Consumer Products Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0
Commissions, fees and reimbursed expenses | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Subscription services
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	324,758	219,379	79,149
Subscription services | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Subscription services | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Subscription services | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Subscription services | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Subscription services | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	324,758	219,379	79,149
Subscription services | Consumer Products Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0
Subscription services | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Service contract revenues
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers			1,090
Service contract revenues | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers			0
Service contract revenues | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers			0
Service contract revenues | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers			1,090
Service contract revenues | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers			0
Service contract revenues | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers			0
Service contract revenues | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers			0
Sale of goods
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	314,506	142,275	58,205
Sale of goods | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Sale of goods | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Sale of goods | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	74,203	56,928	53,348
Sale of goods | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Sale of goods | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	6,737	7,526	4,857
Sale of goods | Consumer Products Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	233,202	77,821
Sale of goods | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	364	0	0
Advertising, licensing and other
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	72,322	41,487	29,649
Advertising, licensing and other | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Advertising, licensing and other | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Advertising, licensing and other | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Advertising, licensing and other | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0	0
Advertising, licensing and other | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	6,194	8,750	9,341
Advertising, licensing and other | Consumer Products Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	0	0
Advertising, licensing and other | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers	66,128	32,737	20,308
Interest income - Loans and securities lending
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending	284,896	245,400	122,723
Interest income - Loans and securities lending | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending	284,896	240,813	122,723
Interest income - Loans and securities lending | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending	0	0	0
Interest income - Loans and securities lending | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending	0	4,587	0
Interest income - Loans and securities lending | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending	0	0	0
Interest income - Loans and securities lending | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending	0	0	0
Interest income - Loans and securities lending | Consumer Products Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending	0	0
Interest income - Loans and securities lending | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending	0	0	0
Trading gains on investments
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading gains on investments	21,603	(148,294)	210,910
Trading gains on investments | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading gains on investments	16,845	(151,816)	203,287
Trading gains on investments | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading gains on investments	4,758	3,522	7,623
Trading gains on investments | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading gains on investments	0	0	0
Trading gains on investments | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading gains on investments	0	0	0
Trading gains on investments | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading gains on investments	0	0	0
Trading gains on investments | Consumer Products Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading gains on investments	0	0
Trading gains on investments | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading gains on investments	0	0	0
Fair value adjustment on loans
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans	20,225	(54,334)	9,635
Fair value adjustment on loans | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans	20,225	(54,334)	9,635
Fair value adjustment on loans | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans	0	0	0
Fair value adjustment on loans | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans	0	0	0
Fair value adjustment on loans | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans	0	0	0
Fair value adjustment on loans | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans	0	0	0
Fair value adjustment on loans | Consumer Products Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans	0	0
Fair value adjustment on loans | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans	0	0	0
Other
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other	28,271	75,746	32,061
Other | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other	22,060	69,115	16,187
Other | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other	6,211	6,631	15,874
Other | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other	0	0	0
Other | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other	0	0	0
Other | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other	0	0	0
Other | Consumer Products Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other	0	0
Other | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other	$ 0	$ 0	$ 0

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Fair Value Adjustment on Loans

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Amount of revenue and income classified as other.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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