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Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | $ 1,261,216 |  | $ 918,741 |
Available-for-sale securities, Fair Value | 1,583,477 | [1] | 1,551,686 |
Investments | 91,465 |  | 91,105 |
Cash equivalents measured at NAV | 1,674 |  | 4,706 |
Derivative contracts, Assets | 127,177 | [2] | 118,668 | [3]
Total Assets | 3,065,009 |  | 2,684,906 |
Financial instruments sold, but not yet purchased, at fair value | 634,311 |  | 497,741 |
Derivative contracts, Liabilities | 127,156 | [4] | 118,651 | [5]
Liabilities, Fair Value Disclosure, Total | 761,467 |  | 616,392 |
U.S. Government Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 10,901 |  | 32,411 |
Financial instruments sold, but not yet purchased, at fair value | 392,431 |  | 273,653 |
U.S. Government Agency Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 194,979 |  | 106,634 |
Available-for-sale securities, Fair Value | 2,215 | [1] | 2,219 |
Financial instruments sold, but not yet purchased, at fair value |  |  | 4,924 |
Asset-Backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 89,007 |  | 19,604 |
Available-for-sale securities, Fair Value | 159,028 |  | 177,853 |
Corporate Fixed Income Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 293,994 |  | 237,671 |
Available-for-sale securities, Fair Value | 507,383 | [1] | 556,161 |
Financial instruments sold, but not yet purchased, at fair value | 133,943 |  | 138,359 |
Corporate Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 69,216 |  | 52,520 |
Investments | 24,464 |  | 22,406 |
Financial instruments sold, but not yet purchased, at fair value | 29,122 |  | 21,576 |
State and Municipal Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 271,417 |  | 223,155 |
Available-for-sale securities, Fair Value | 2,337 | [1] | 2,351 |
Auction Rate Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 739 |  | 783 |
Other Investment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 39,387 | [6] | 39,655 | [7]
Investments in Funds and Partnerships Measured at NAV [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 26,875 |  | 28,261 |
Agency Mortgage-Backed Securities [Member] | Agency Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 259,206 |  | 159,903 |
Available-for-sale securities, Fair Value | 845,462 | [1] | 746,170 |
Financial instruments sold, but not yet purchased, at fair value | 74,742 |  | 52,664 |
Agency Mortgage-Backed Securities [Member] | Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities, Fair Value | 66,830 | [1] | 66,671 |
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, Fair Value | 222 | [1] | 261 |
Sovereign Debt [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 1,261,216 |  | 918,741 |
Other [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 72,496 | [8] | 86,843 | [9]
Financial instruments sold, but not yet purchased, at fair value | 4,073 | [10] | 6,565 | [11]
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 12,403 |  | 10,386 |
Total Assets | 92,143 |  | 95,165 |
Financial instruments sold, but not yet purchased, at fair value | 421,553 |  | 295,229 |
Liabilities, Fair Value Disclosure, Total | 421,553 |  | 295,229 |
Level 1 [Member] | U.S. Government Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 10,901 |  | 32,411 |
Financial instruments sold, but not yet purchased, at fair value | 392,431 |  | 273,653 |
Level 1 [Member] | Corporate Fixed Income Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned |  |  | 210 |
Level 1 [Member] | Corporate Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 68,839 |  | 52,158 |
Investments | 12,371 |  | 10,313 |
Financial instruments sold, but not yet purchased, at fair value | 29,122 |  | 21,576 |
Level 1 [Member] | Other Investment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 32 | [6] | 73 | [7]
Level 1 [Member] | Sovereign Debt [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 79,740 |  | 84,779 |
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities, Fair Value | 1,583,477 |  | 1,551,686 |
Investments | 221 |  | 330 |
Derivative contracts, Assets | 127,177 | [2] | 118,668 | [3]
Total Assets | 2,825,435 |  | 2,420,184 |
Financial instruments sold, but not yet purchased, at fair value | 209,035 |  | 198,676 |
Derivative contracts, Liabilities | 127,156 | [4] | 118,651 | [5]
Liabilities, Fair Value Disclosure, Total | 336,191 |  | 317,327 |
Level 2 [Member] | U.S. Government Agency Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 194,979 |  | 106,634 |
Available-for-sale securities, Fair Value | 2,215 |  | 2,219 |
Financial instruments sold, but not yet purchased, at fair value |  |  | 4,924 |
Level 2 [Member] | Asset-Backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 87,804 |  | 18,106 |
Available-for-sale securities, Fair Value | 159,028 |  | 177,853 |
Level 2 [Member] | Corporate Fixed Income Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 293,994 |  | 237,461 |
Available-for-sale securities, Fair Value | 507,383 |  | 556,161 |
Financial instruments sold, but not yet purchased, at fair value | 133,943 |  | 138,359 |
Level 2 [Member] | Corporate Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 377 |  | 362 |
Investments | 215 |  | 215 |
Level 2 [Member] | State and Municipal Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 271,417 |  | 223,155 |
Available-for-sale securities, Fair Value | 2,337 |  | 2,351 |
Level 2 [Member] | Other Investment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 6 | [6] | 115 | [7]
Level 2 [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 | 259,206 |  | 159,903 |
Available-for-sale securities, Fair Value | 845,462 |  | 746,170 |
Financial instruments sold, but not yet purchased, at fair value | 74,742 |  | 52,664 |
Level 2 [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, Fair Value | 66,830 |  | 66,671 |
Level 2 [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, Fair Value | 222 |  | 261 |
Level 2 [Member] | Sovereign Debt [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 1,114,560 |  | 749,500 |
Level 2 [Member] | Other [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 6,783 | [8] | 3,879 | [9]
Financial instruments sold, but not yet purchased, at fair value | 350 | [10] | 2,729 | [11]
Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 51,966 |  | 52,128 |
Total Assets | 118,882 |  | 136,590 |
Financial instruments sold, but not yet purchased, at fair value | 3,723 |  | 3,836 |
Liabilities, Fair Value Disclosure, Total | 3,723 |  | 3,836 |
Level 3 [Member] | Asset-Backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 1,203 |  | 1,498 |
Level 3 [Member] | Corporate Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 11,878 |  | 11,878 |
Level 3 [Member] | Auction Rate Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 739 |  | 783 |
Level 3 [Member] | Other Investment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | 39,349 | [6] | 39,467 | [7]
Level 3 [Member] | Sovereign Debt [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 66,916 |  | 84,462 |
Level 3 [Member] | Other [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financial instruments owned | 65,713 | [8] | 82,964 | [9]
Financial instruments sold, but not yet purchased, at fair value | $ 3,723 | [10] | $ 3,836 | [11]
[1] | Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[2] | Included in other assets in the consolidated statements of financial condition.
[3] | Included in other assets in the consolidated statements of financial condition.
[4] | Included in accounts payable and accrued expenses in the consolidated statements of financial condition.
[5] | Included in accounts payable and accrued expenses in the consolidated statements of financial condition
[6] | Primarily includes private company investments.
[7] | Primarily includes private company investments.
[8] | Includes syndicated loans, non-agency mortgage-backed securities, and sovereign debt.
[9] | Includes syndicated loans, non-agency mortgage-backed securities, and sovereign debt.
[10] | Includes syndicated loans and sovereign debt.
[11] | Includes syndicated loans, state and municipal securities, and asset-backed securities.

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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