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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of revenues from contracts with customers (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | $ 197,227 | $ 263,404
Total revenues | 186,063 | 297,590
Capital Markets | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 21,956 | 57,475
Total revenues | 4,362 | 89,823
Wealth Management | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 40,848 | 49,944
Total revenues | 47,278 | 51,782
Communications | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 64,474 | 82,366
Total revenues | 64,474 | 82,366
Communications | All Other |  |
Revenue from External Customer [Line Items] |  |
Total revenues | 19,719 | 22,097
Consumer Products | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 42,103 | 51,522
Total revenues | 42,103 | 51,522
E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 6,997 |
Total revenues | 6,997 | 0
All Other | All Other |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 20,849 | 22,097
Total revenues | 20,849 | 22,097
Corporate finance, consulting and investment banking fees |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 17,729 | 50,163
Corporate finance, consulting and investment banking fees | Capital Markets | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 17,729 | 50,163
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 | Communications | 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 | E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 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
Wealth and asset management fees |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 38,101 | 47,113
Wealth and asset management fees | Capital Markets | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 872 | 1,056
Wealth and asset management fees | Wealth Management | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 37,229 | 46,057
Wealth and asset management fees | Communications | 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 | E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 0 |
Wealth and asset management fees | All Other | All Other |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 0 | 0
Commissions, fees and reimbursed expenses |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 6,974 | 10,143
Commissions, fees and reimbursed expenses | Capital Markets | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 3,355 | 6,256
Commissions, fees and reimbursed expenses | Wealth Management | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 3,619 | 3,887
Commissions, fees and reimbursed expenses | Communications | 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 | E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 0 |
Commissions, fees and reimbursed expenses | All Other | All Other |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 0 | 0
Subscription services |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 62,117 | 79,738
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 | Communications | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 62,117 | 79,738
Subscription services | Consumer Products | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 0 | 0
Subscription services | E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 0 |
Subscription services | All Other | 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 | 47,455 | 53,433
Total revenues | 47,455 | 53,433
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 | Communications | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 1,301 | 1,296
Sale of goods | Consumer Products | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 42,103 | 51,522
Sale of goods | E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 3,528 |
Sale of goods | All Other | All Other |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 523 | 615
Advertising and other |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 24,851 | 22,814
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 | Communications | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 1,056 | 1,332
Advertising and other | Consumer Products | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 0 | 0
Advertising and other | E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 3,469 |
Advertising and other | All Other | All Other |  |
Revenue from External Customer [Line Items] |  |
Total revenues from contracts with customers | 20,326 | 21,482
Trading gains (losses), net |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | (16,171) | (17,667)
Trading gains (losses), net | Capital Markets | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | (16,783) | (18,267)
Trading gains (losses), net | Wealth Management | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 612 | 600
Trading gains (losses), net | Communications | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Trading gains (losses), net | Consumer Products | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Trading gains (losses), net | E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 |
Trading gains (losses), net | All Other | All Other |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Fair value adjustments on loans |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | (8,096) | (12,201)
Total revenues | (8,096) | (12,201)
Fair value adjustments on loans | Capital Markets | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | (8,096) | (12,201)
Total revenues | (8,096) | (12,201)
Fair value adjustments on loans | Wealth Management | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Fair value adjustments on loans | Communications | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Fair value adjustments on loans | Consumer Products | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Fair value adjustments on loans | E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 |
Fair value adjustments on loans | All Other | All Other |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Interest income - loans |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 3,196 | 22,135
Total revenues | 3,196 | 22,135
Interest income - loans | Capital Markets | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 3,196 | 22,135
Total revenues | 3,196 | 22,135
Interest income - loans | Wealth Management | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Interest income - loans | Communications | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Interest income - loans | Consumer Products | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Interest income - loans | E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 |
Interest income - loans | All Other | All Other |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Interest income - securities lending |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 840 | 37,809
Total revenues | 840 | 37,809
Interest income - securities lending | Capital Markets | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 840 | 37,809
Total revenues | 840 | 37,809
Interest income - securities lending | Wealth Management | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Interest income - securities lending | Communications | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Interest income - securities lending | Consumer Products | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Interest income - securities lending | E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 |
Interest income - securities lending | All Other | All Other |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Other |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 9,067 | 4,110
Other | Capital Markets | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 3,249 | 2,872
Other | Wealth Management | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 5,818 | 1,238
Other | Communications | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Other | Consumer Products | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 | 0
Other | E-Commerce | Operating Segments |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | 0 |
Other | All Other | All Other |  |
Revenue from External Customer [Line Items] |  |
Revenue not from contract with customer | $ 0 | $ 0

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