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Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | $ 918,741 |  | $ 731,752 |
Available-for-sale securities |  | 1,551,686 | [1] | 1,636,041 |
Investments |  | 91,105 |  | 99,376 |
Cash equivalents measured at NAV |  | 4,706 |  | 1,650 |
Derivative contracts, Assets |  | 118,668 | [2] | 142,042 | [3]
Total Assets |  | 2,684,906 |  | 2,610,861 |
Financial instruments sold, but not yet purchased, at fair value |  | 497,741 |  | 454,817 |
Derivative contracts, Liabilities |  | 118,651 | [4] | 142,028 | [5]
Total Liabilities |  | 616,392 |  | 596,845 |
U.S. Government Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 32,411 |  | 38,956 |
Financial instruments sold, but not yet purchased, at fair value |  | 273,653 |  | 254,265 |
U.S. Government Agency Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 106,634 |  | 73,608 |
Available-for-sale securities |  | 2,219 | [1] | 2,148 |
Financial instruments sold, but not yet purchased, at fair value |  | 4,924 |  | 3,971 |
Asset-Backed Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 19,604 |  | 8,270 |
Available-for-sale securities |  | 177,853 |  | 207,725 |
Corporate Fixed Income Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 237,671 |  | 202,169 |
Available-for-sale securities |  | 556,161 | [1] | 566,294 |
Financial instruments sold, but not yet purchased, at fair value |  | 138,359 |  | 134,381 |
Corporate Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 52,520 |  | 38,129 |
Investments |  | 22,406 |  | 23,597 |
Financial instruments sold, but not yet purchased, at fair value |  | 21,576 |  | 11,590 |
State And Municipal Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 223,155 |  | 126,237 |
Available-for-sale securities |  | 2,351 | [1] | 2,351 |
Other Investment [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 39,655 | [6] | 37,136 | [7]
Investments In Funds And Partnerships Measured At Net Asset Value [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 28,261 |  | 23,962 |
Agency Mortgage-Backed Securities [Member] | Agency Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  |  |  | 172,642 |
Available-for-sale securities |  | 746,170 | [1] | 791,022 |
Financial instruments sold, but not yet purchased, at fair value |  | 52,664 |  | 44,793 |
Agency Mortgage-Backed Securities [Member] | Commercial [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities |  | 66,671 | [1] | 66,113 |
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 |  | 261 | [1] | 388 |
Auction Rate Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 783 |  | 14,681 |
Sovereign Debt [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 918,741 |  | 731,752 |
Financial instruments sold, but not yet purchased, at fair value | [8] | 6,565 |  |  |
Other [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 86,843 | [9] | 71,741 | [10]
Financial instruments sold, but not yet purchased, at fair value | [11] |  |  | 5,817 |
Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 10,386 |  | 10,045 |
Total Assets |  | 95,165 |  | 87,073 |
Financial instruments sold, but not yet purchased, at fair value |  | 295,229 |  | 265,943 |
Total Liabilities |  | 295,229 |  | 265,943 |
Level 1 [Member] | U.S. Government Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 32,411 |  | 38,956 |
Financial instruments sold, but not yet purchased, at fair value |  | 273,653 |  | 254,265 |
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 |  | 689 |
Financial instruments sold, but not yet purchased, at fair value |  |  |  | 88 |
Level 1 [Member] | Corporate Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 52,158 |  | 37,383 |
Investments |  | 10,313 |  | 9,928 |
Financial instruments sold, but not yet purchased, at fair value |  | 21,576 |  | 11,590 |
Level 1 [Member] | Other Investment [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 73 | [6] | 117 | [7]
Level 1 [Member] | Sovereign Debt [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 84,779 |  | 77,028 |
Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities |  | 1,551,686 |  | 1,636,041 |
Investments |  | 330 |  | 1,836 |
Derivative contracts, Assets |  | 118,668 | [2] | 142,042 | [3]
Total Assets |  | 2,420,184 |  | 2,362,576 |
Financial instruments sold, but not yet purchased, at fair value |  | 198,676 |  | 183,093 |
Derivative contracts, Liabilities |  | 118,651 | [4] | 142,028 | [5]
Total Liabilities |  | 317,327 |  | 325,121 |
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 |  | 106,634 |  | 73,608 |
Available-for-sale securities |  | 2,219 |  | 2,148 |
Financial instruments sold, but not yet purchased, at fair value |  | 4,924 |  | 3,971 |
Level 2 [Member] | Asset-Backed Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 18,106 |  | 6,091 |
Available-for-sale securities |  | 177,853 |  | 207,725 |
Level 2 [Member] | Corporate Fixed Income Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 237,461 |  | 201,480 |
Available-for-sale securities |  | 556,161 |  | 566,294 |
Financial instruments sold, but not yet purchased, at fair value |  | 138,359 |  | 134,293 |
Level 2 [Member] | Corporate Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 362 |  | 746 |
Investments |  | 215 |  | 1,791 |
Level 2 [Member] | State And Municipal Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 223,155 |  | 126,237 |
Available-for-sale securities |  | 2,351 |  | 2,351 |
Level 2 [Member] | Other Investment [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 115 | [6] | 45 | [7]
Level 2 [Member] | Agency Mortgage-Backed Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 159,903 |  |  |
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 |  |  |  | 172,642 |
Available-for-sale securities |  | 746,170 |  | 791,022 |
Financial instruments sold, but not yet purchased, at fair value |  | 52,664 |  | 44,793 |
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 |  | 66,671 |  | 66,113 |
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 |  | 261 |  | 388 |
Level 2 [Member] | Sovereign Debt [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 749,500 |  | 582,657 |
Financial instruments sold, but not yet purchased, at fair value | [8] | 2,729 |  |  |
Level 2 [Member] | Other [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 3,879 | [9] | 1,853 | [10]
Financial instruments sold, but not yet purchased, at fair value |  |  |  | 36 |
Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 52,128 |  | 63,533 |
Total Assets |  | 136,590 |  | 135,600 |
Financial instruments sold, but not yet purchased, at fair value |  | 3,836 |  | 5,781 |
Total Liabilities |  | 3,836 |  | 5,781 |
Level 3 [Member] | Asset-Backed Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 1,498 |  | 2,179 |
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] | Other Investment [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 39,467 | [6] | 36,974 | [7]
Level 3 [Member] | Auction Rate Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 783 |  | 14,681 |
Level 3 [Member] | Sovereign Debt [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 84,462 |  | 72,067 |
Financial instruments sold, but not yet purchased, at fair value | [8] | 3,836 |  |  |
Level 3 [Member] | Other [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | $ 82,964 | [9] | 69,888 | [10]
Financial instruments sold, but not yet purchased, at fair value |  |  |  | $ 5,781 |
[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, state and municipal securities, and asset-backed securities.
[9] | Includes syndicated loans, non-agency mortgage-backed securities, and sovereign debt.
[10] | Includes syndicated loans, non-agency mortgage-backed securities, and sovereign debt.
[11] | Includes syndicated loans and state and municipal securities.

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