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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, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | $ 1,056,745 |  | $ 731,752 |
Available-for-sale securities, at fair value |  | 1,512,233 | [1] | 1,636,041 |
Investments |  | 91,154 |  | 99,376 |
Cash equivalents measured at NAV |  | 1,870 |  | 1,650 |
Derivative contracts, Assets | [2] | 166,038 |  | 142,042 |
Total Assets |  | 2,828,040 |  | 2,610,861 |
Financial instruments sold, but not yet purchased, at fair value |  | 578,290 |  | 454,817 |
Derivative contracts, Liabilities | [3] | 166,015 |  | 142,028 |
Total, Liabilities |  | 744,305 |  | 596,845 |
U.S. Government Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 10,479 |  | 38,956 |
Financial instruments sold, but not yet purchased, at fair value |  | 334,630 |  | 254,265 |
U.S. Government Agency Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 158,086 |  | 73,608 |
Available-for-sale securities, at fair value |  | 2,135 | [1] | 2,148 |
Financial instruments sold, but not yet purchased, at fair value |  | 5,439 |  | 3,971 |
Asset-Backed Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 63,046 |  | 8,270 |
Available-for-sale securities, at fair value |  | 188,677 |  | 207,725 |
Corporate Fixed Income Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 321,842 |  | 202,169 |
Available-for-sale securities, at fair value |  | 537,850 | [1] | 566,294 |
Financial instruments sold, but not yet purchased, at fair value |  | 135,080 |  | 134,381 |
Corporate Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 43,091 |  | 38,129 |
Investments |  | 24,877 |  | 23,597 |
Financial instruments sold, but not yet purchased, at fair value |  | 20,114 |  | 11,590 |
State and Municipal Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 163,139 |  | 126,237 |
Available-for-sale securities, at fair value |  | 2,294 | [1] | 2,351 |
Other Investment [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments | [4] | 39,396 |  | 37,136 |
Investments in Funds and Partnerships Measured at NAV [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 26,098 |  | 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 |  | 199,294 |  | 172,642 |
Available-for-sale securities, at fair value |  | 715,250 | [1] | 791,022 |
Financial instruments sold, but not yet purchased, at fair value |  | 70,344 |  | 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, at fair value |  | 65,695 | [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, at fair value |  | 332 | [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 |  | 1,056,745 |  | 731,752 |
Financial instruments sold, but not yet purchased, at fair value |  | 12,683 | [5] | 5,817 | [6]
Other [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 97,768 | [7] | 71,741 | [8]
Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 10,959 |  | 10,045 |
Total Assets |  | 64,452 |  | 87,073 |
Financial instruments sold, but not yet purchased, at fair value |  | 354,744 |  | 265,943 |
Total, Liabilities |  | 354,744 |  | 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 |  | 10,479 |  | 38,956 |
Financial instruments sold, but not yet purchased, at fair value |  | 334,630 |  | 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 |  | 197 |  | 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 |  | 42,817 |  | 37,383 |
Investments |  | 10,888 |  | 9,928 |
Financial instruments sold, but not yet purchased, at fair value |  | 20,114 |  | 11,590 |
Level 1 [Member] | Other Investment [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments | [4] | 71 |  | 117 |
Level 1 [Member] | Sovereign Debt [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 53,493 |  | 77,028 |
Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value |  | 1,512,233 |  | 1,636,041 |
Investments |  | 2,226 |  | 1,836 |
Derivative contracts, Assets | [2] | 166,038 |  | 142,042 |
Total Assets |  | 2,593,563 |  | 2,362,576 |
Financial instruments sold, but not yet purchased, at fair value |  | 217,837 |  | 183,093 |
Derivative contracts, Liabilities | [3] | 166,015 |  | 142,028 |
Total, Liabilities |  | 383,852 |  | 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 |  | 158,086 |  | 73,608 |
Available-for-sale securities, at fair value |  | 2,135 |  | 2,148 |
Financial instruments sold, but not yet purchased, at fair value |  | 5,439 |  | 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 |  | 61,377 |  | 6,091 |
Available-for-sale securities, at fair value |  | 188,677 |  | 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 |  | 321,645 |  | 201,480 |
Available-for-sale securities, at fair value |  | 537,850 |  | 566,294 |
Financial instruments sold, but not yet purchased, at fair value |  | 135,080 |  | 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 |  | 274 |  | 746 |
Investments |  | 2,111 |  | 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 |  | 163,139 |  | 126,237 |
Available-for-sale securities, at fair value |  | 2,294 |  | 2,351 |
Level 2 [Member] | Other Investment [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments | [4] | 115 |  | 45 |
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 |  | 199,294 |  | 172,642 |
Available-for-sale securities, at fair value |  | 715,250 |  | 791,022 |
Financial instruments sold, but not yet purchased, at fair value |  | 70,344 |  | 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, at fair value |  | 65,695 |  | 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, at fair value |  | 332 |  | 388 |
Level 2 [Member] | Sovereign Debt [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 913,066 |  | 582,657 |
Financial instruments sold, but not yet purchased, at fair value |  | 6,974 | [5] | 36 | [6]
Level 2 [Member] | Other [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 9,251 | [7] | 1,853 | [8]
Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  | 51,871 |  | 63,533 |
Total Assets |  | 142,057 |  | 135,600 |
Financial instruments sold, but not yet purchased, at fair value |  | 5,709 |  | 5,781 |
Total, Liabilities |  | 5,709 |  | 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 |  | 1,669 |  | 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 | [4] | 39,210 |  | 36,974 |
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 |  | 90,186 |  | 72,067 |
Level 3 [Member] | Other [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Financial instruments owned |  | 88,517 | [7] | 69,888 | [8]
Financial instruments sold, but not yet purchased, at fair value |  | $ 5,709 | [5] | $ 5,781 | [6]
[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 accounts payable and accrued expenses in the consolidated statements of financial condition.
[4] | Primarily includes private company investments.
[5] | Includes asset-backed securities and syndicated loans.
[6] | Includes syndicated loans and state and municipal securities.
[7] | Includes syndicated loans and non-agency mortgage-backed securities.
[8] | Includes syndicated loans, non-agency mortgage-backed securities, and sovereign debt.

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