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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of revenues from contracts with customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers $ 185,877 $ 188,166 $ 367,906 $ 385,393
Total revenues 239,117 225,302 591,177 411,365
Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 26,311 19,902 50,039 50,010
Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 44,355 36,864 78,600 57,539
Total revenues 53,712 61,292 225,823 63,392
Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 30,932 31,949 62,552 72,797
Total revenues 57,953 38,621 110,128 85,899
Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 38,788 39,907 79,578 81,460
Total revenues 38,788 39,907 79,578 81,460
magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 8,567 9,777 17,350 19,578
Total revenues 8,567 9,777 17,350 19,578
Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 7,368 9,232 14,905 18,719
Total revenues 7,368 9,232 14,905 18,719
UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 2,881 3,287 5,702 6,920
Total revenues 2,881 3,287 5,702 6,920
Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 43,537 43,284 87,652 85,387
Total revenues 43,537 43,284 87,652 85,387
Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 9,449 13,866 21,567 42,993
Total revenues 26,311 19,902 50,039 50,010
Corporate finance, consulting and investment banking fees        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 33,947 32,346 61,406 50,075
Corporate finance, consulting and investment banking fees | Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 36,310 32,346 65,044 49,723
Corporate finance, consulting and investment banking fees | Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Corporate finance, consulting and investment banking fees | Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Corporate finance, consulting and investment banking fees | magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Corporate finance, consulting and investment banking fees | Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Corporate finance, consulting and investment banking fees | UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Corporate finance, consulting and investment banking fees | Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Corporate finance, consulting and investment banking fees | Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers (2,363) 0 (3,638) 352
Wealth and asset management fees        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 28,989 30,332 58,797 68,433
Wealth and asset management fees | Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Wealth and asset management fees | Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 28,438 29,373 56,657 66,602
Wealth and asset management fees | Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Wealth and asset management fees | magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Wealth and asset management fees | Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Wealth and asset management fees | UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Wealth and asset management fees | Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Wealth and asset management fees | Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 551 959 2,140 1,831
Commissions, fees and reimbursed expenses        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 10,545 7,159 19,492 14,133
Commissions, fees and reimbursed expenses | Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 8,045 4,518 13,556 7,816
Commissions, fees and reimbursed expenses | Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 2,494 2,576 5,895 6,195
Commissions, fees and reimbursed expenses | Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Commissions, fees and reimbursed expenses | magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Commissions, fees and reimbursed expenses | Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Commissions, fees and reimbursed expenses | UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Commissions, fees and reimbursed expenses | Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Commissions, fees and reimbursed expenses | Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 6 65 41 122
Subscription services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 55,811 59,689 113,980 121,806
Subscription services | Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Subscription services | Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Subscription services | Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 38,788 39,907 79,578 81,460
Subscription services | magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 7,798 8,930 15,754 17,765
Subscription services | Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 6,878 8,065 13,904 16,606
Subscription services | UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 2,347 2,787 4,744 5,975
Subscription services | Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Subscription services | Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Sale of goods        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 44,600 45,073 89,967 92,528
Total revenues 44,600 45,073 89,967 92,528
Sale of goods | Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Sale of goods | Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Sale of goods | Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Sale of goods | magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 286 304 596 659
Sale of goods | Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 490 1,167 1,001 2,113
Sale of goods | UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Sale of goods | Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 43,537 43,284 87,652 85,387
Sale of goods | Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 287 318 718 4,369
Advertising and other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 11,985 13,567 24,264 38,418
Advertising and other | Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Advertising and other | Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Advertising and other | Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Advertising and other | magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 483 543 1,000 1,154
Advertising and other | Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Advertising and other | UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 534 500 958 945
Advertising and other | Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Advertising and other | Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues from contracts with customers 10,968 12,524 22,306 36,319
Trading gains (losses), net        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 12,874 27,680 157,935 11,509
Trading gains (losses), net | Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 4,363 21,249 139,666 3,983
Trading gains (losses), net | Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 9,251 5,200 19,347 5,812
Trading gains (losses), net | Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Trading gains (losses), net | magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Trading gains (losses), net | Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Trading gains (losses), net | UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Trading gains (losses), net | Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Trading gains (losses), net | Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues (740) 1,231 (1,078) 1,714
Fair value adjustments on loans        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 4,245 800 10,790 (7,296)
Fair value adjustments on loans | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 3,494 800 10,039 (4,165)
Fair value adjustments on loans | Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 751 0 751 (3,131)
Fair value adjustments on loans | Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Fair value adjustments on loans | Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Fair value adjustments on loans | magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Fair value adjustments on loans | Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Fair value adjustments on loans | UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Fair value adjustments on loans | Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Fair value adjustments on loans | Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 3,494 800 10,039 (4,165)
Interest income - loans        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 2,171 3,853 3,885 7,049
Interest income - loans | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 1,144 3,853 2,851 6,984
Interest income - loans | Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 1,027 0 1,034 65
Interest income - loans | Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - loans | Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - loans | magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - loans | Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - loans | UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - loans | Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - loans | Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 1,144 3,853 2,851 6,984
Interest income - securities lending        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 1,632 2,124 2,883 2,964
Interest income - securities lending | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - securities lending | Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 1,632 2,124 2,883 2,964
Interest income - securities lending | Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - securities lending | Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - securities lending | magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - securities lending | Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - securities lending | UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - securities lending | Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Interest income - securities lending | Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 32,318 2,679 47,778 11,746
Other | Capital Markets | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 1,584 1,055 2,889 1,972
Other | Wealth Management | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 17,770 1,472 28,229 7,290
Other | Lingo | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Other | magicJack | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Other | Marconi Wireless | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Other | UOL | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Other | Consumer Products | Operating Segments        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues 0 0 0 0
Other | Corporate & All Other | Corporate & All Other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Total revenues $ 12,964 $ 152 $ 16,660 $ 2,484