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Fair Value Of Financial Instruments (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | $ 1,540,478 |  | $ 1,169,008 |
Available-for-sale securities | 1,688,636 |  | 1,584,598 |
Financial instruments sold, but not yet purchased, at fair value | 806,120 |  | 646,271 |
U.S. Government Agency Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 2,361 |  |  |
Corporate Fixed Income Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 407,352 |  |  |
State and Municipal Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 2,351 |  |  |
Agency Mortgage-Backed Securities [Member] | Agency Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,152,960 |  | 921,563 |
Agency Mortgage-Backed Securities [Member] | Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 10,976 |  | 67,956 |
Agency Mortgage-Backed Securities [Member] | Non-Agency [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 158 |  | 199 |
Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,688,636 |  | 1,584,598 |
Investments | 80,267 |  | 75,358 |
Derivative contracts, Assets | 76,114 | [1] | 110,814 | [2]
Cash equivalents measured at NAV | 1,596 |  | 1,932 |
Total Assets | 3,387,091 |  | 2,941,710 |
Financial instruments sold, but not yet purchased, at fair value | 806,120 |  | 646,271 |
Derivative contracts, Liabilities | 76,125 | [3] | 110,825 | [4]
Total Liabilities | 882,245 |  | 757,096 |
Fair Value, Recurring [Member] | U.S. Government Agency Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 275,046 |  | 149,479 |
Available-for-sale securities | 2,361 |  | 2,266 |
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 60,135 |  | 113,033 |
Available-for-sale securities | 112,478 |  | 126,273 |
Fair Value, Recurring [Member] | Corporate Fixed Income Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 311,339 |  | 274,207 |
Available-for-sale securities | 407,352 |  | 463,992 |
Financial instruments sold, but not yet purchased, at fair value | 153,144 |  | 174,425 |
Fair Value, Recurring [Member] | Corporate Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 123,932 |  | 50,787 |
Investments | 34,305 |  | 30,227 |
Financial instruments sold, but not yet purchased, at fair value | 116,835 |  | 34,437 |
Fair Value, Recurring [Member] | State and Municipal Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 241,755 |  | 229,342 |
Available-for-sale securities | 2,351 |  | 2,349 |
Fair Value, Recurring [Member] | Auction Rate Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 557 |  | 558 |
Fair Value, Recurring [Member] | Other Investment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 13,589 | [5] | 14,378 | [6]
Fair Value, Recurring [Member] | Investments in Funds and Partnerships Measured at NAV [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 31,816 |  | 30,195 |
Fair Value, Recurring [Member] | Assets At Fair Value On Recurring Basis Before Cash Equivalents Measured at NAV [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets | 3,385,495 |  | 2,939,778 |
Fair Value, Recurring [Member] | U.S. Government Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 15,370 |  | 20,045 |
Financial instruments sold, but not yet purchased, at fair value | 366,214 |  | 370,373 |
Fair Value, Recurring [Member] | Agency Mortgage-Backed Securities [Member] | Agency Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 446,693 |  | 262,629 |
Available-for-sale securities | 1,152,960 |  | 921,563 |
Financial instruments sold, but not yet purchased, at fair value | 168,692 |  | 65,946 |
Fair Value, Recurring [Member] | Agency Mortgage-Backed Securities [Member] | Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 10,976 |  | 67,956 |
Fair Value, Recurring [Member] | Agency Mortgage-Backed Securities [Member] | Non-Agency [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 158 |  | 199 |
Sovereign Debt [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 1,540,478 |  | 1,169,008 |
Other [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 66,208 | [7] | 69,486 | [8]
Syndicated Loans [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments sold, but not yet purchased, at fair value | 1,235 |  | 1,090 |
Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 15,631 |  | 14,691 |
Total Assets | 154,986 |  | 85,715 |
Financial instruments sold, but not yet purchased, at fair value | 483,049 |  | 404,810 |
Total Liabilities | 483,049 |  | 404,810 |
Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Fixed Income Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 58 |  | 507 |
Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 123,927 |  | 50,472 |
Investments | 15,630 |  | 14,661 |
Financial instruments sold, but not yet purchased, at fair value | 116,835 |  | 34,437 |
Level 1 [Member] | Fair Value, Recurring [Member] | Other Investment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 1 | [5] | 30 | [6]
Level 1 [Member] | Fair Value, Recurring [Member] | U.S. Government Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 15,370 |  | 20,045 |
Financial instruments sold, but not yet purchased, at fair value | 366,214 |  | 370,373 |
Level 1 [Member] | Sovereign Debt [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 139,355 |  | 71,024 |
Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,688,636 |  | 1,584,598 |
Investments | 1 |  | 1 |
Derivative contracts, Assets | 76,114 | [1] | 110,814 | [2]
Total Assets | 3,112,436 |  | 2,733,896 |
Financial instruments sold, but not yet purchased, at fair value | 321,836 |  | 240,371 |
Derivative contracts, Liabilities | 76,125 | [3] | 110,825 | [4]
Total Liabilities | 397,961 |  | 351,196 |
Level 2 [Member] | Fair Value, Recurring [Member] | U.S. Government Agency Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 275,046 |  | 149,479 |
Available-for-sale securities | 2,361 |  | 2,266 |
Level 2 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 57,996 |  | 111,999 |
Available-for-sale securities | 112,478 |  | 126,273 |
Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Fixed Income Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 311,281 |  | 273,700 |
Available-for-sale securities | 407,352 |  | 463,992 |
Financial instruments sold, but not yet purchased, at fair value | 153,144 |  | 174,425 |
Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 5 |  | 315 |
Investments | 1 |  | 1 |
Level 2 [Member] | Fair Value, Recurring [Member] | State and Municipal Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 241,755 |  | 229,342 |
Available-for-sale securities | 2,351 |  | 2,349 |
Level 2 [Member] | Fair Value, Recurring [Member] | Agency Mortgage-Backed Securities [Member] | Agency Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 446,693 |  | 262,629 |
Available-for-sale securities | 1,152,960 |  | 921,563 |
Financial instruments sold, but not yet purchased, at fair value | 168,692 |  | 65,946 |
Level 2 [Member] | Fair Value, Recurring [Member] | Agency Mortgage-Backed Securities [Member] | Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 10,976 |  | 67,956 |
Level 2 [Member] | Fair Value, Recurring [Member] | Agency Mortgage-Backed Securities [Member] | Non-Agency [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 158 |  | 199 |
Level 2 [Member] | Sovereign Debt [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 1,347,685 |  | 1,038,483 |
Level 2 [Member] | Other [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 14,909 | [7] | 11,019 | [8]
Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 32,819 |  | 30,471 |
Total Assets | 86,257 |  | 89,972 |
Financial instruments sold, but not yet purchased, at fair value | 1,235 |  | 1,090 |
Total Liabilities | 1,235 |  | 1,090 |
Level 3 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 2,139 |  | 1,034 |
Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 18,674 |  | 15,565 |
Level 3 [Member] | Fair Value, Recurring [Member] | Auction Rate Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 557 |  | 558 |
Level 3 [Member] | Fair Value, Recurring [Member] | Other Investment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 13,588 | [5] | 14,348 | [6]
Level 3 [Member] | Sovereign Debt [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 53,438 |  | 59,501 |
Level 3 [Member] | Other [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 51,299 | [7] | 58,467 | [8]
Level 3 [Member] | Syndicated Loans [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments sold, but not yet purchased, at fair value | $ 1,235 |  | $ 1,090 |
[1] | Included in other assets in the consolidated statements of financial condition.
[2] | Included in other assets in the consolidated statements of financial condition.
[3] | Included in accounts payable and accrued expenses in the consolidated statements of financial condition.
[4] | Included in accounts payable and accrued expenses in the consolidated statements of financial condition
[5] | Primarily includes private company investments.
[6] | Primarily includes private company investments.
[7] | Includes syndicated loans, non-agency mortgage-backed securities, and sovereign debt.
[8] | Includes syndicated loans, non-agency mortgage-backed securities, and sovereign debt.

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