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Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned $ 973,802 $ 731,752
Available-for-sale securities 1,624,458 1,636,041
Investments 101,875 99,376
Cash equivalents measured at NAV 2,569 1,650
Derivative Assets 116,772 [1] 142,042 [2]
Total Assets 2,819,476 2,610,861
Financial instruments sold, but not yet purchased, at fair value 653,881 454,817
Derivative contracts, Liabilities [3] 116,758 142,028
Total, Liabilities 770,639 596,845
U.S. Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 42,530 38,956
Financial instruments sold, but not yet purchased, at fair value 377,430 254,265
U.S. Government Agency Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 157,385 73,608
Available-for-sale securities 2,189 [4] 2,148
Financial instruments sold, but not yet purchased, at fair value 29,110 3,971
Asset-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 46,691 8,270
Available-for-sale securities 209,540 [4] 207,725
Corporate Fixed Income Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 203,332 202,169
Available-for-sale securities 550,322 [4] 566,294
Financial instruments sold, but not yet purchased, at fair value 175,354 134,381
Corporate Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 46,995 38,129
Investments 23,779 23,597
Financial instruments sold, but not yet purchased, at fair value 15,148 11,590
State And Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 101,033 126,237
Available-for-sale securities 2,351 [4] 2,351
Auction Rate Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 14,680 14,681
Other Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 37,513 [5] 37,136 [6]
Investments in Funds and Partnerships Measured at NAV [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 25,903 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 276,964 172,642
Available-for-sale securities 792,969 [4] 791,022
Financial instruments sold, but not yet purchased, at fair value 50,768 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 66,695 [4] 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 392 [4] 388
Sovereign Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 973,802 731,752
Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 98,872 [7] 71,741 [8]
Financial instruments sold, but not yet purchased, at fair value 6,071 [9] 5,817 [10]
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0  
Investments 10,321 10,045
Derivative Assets [1] 0  
Total Assets 99,855 87,073
Financial instruments sold, but not yet purchased, at fair value 392,771 265,943
Total, Liabilities 392,771 265,943
Level 1 [Member] | U.S. Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 42,530 38,956
Financial instruments sold, but not yet purchased, at fair value 377,430 254,265
Level 1 [Member] | Corporate Fixed Income Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 269 689
Financial instruments sold, but not yet purchased, at fair value 193 88
Level 1 [Member] | Corporate Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 46,735 37,383
Investments 10,221 9,928
Financial instruments sold, but not yet purchased, at fair value 15,148 11,590
Level 1 [Member] | Auction Rate Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   0
Level 1 [Member] | Other Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 100 [5] 117 [6]
Level 1 [Member] | Sovereign Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 89,534 77,028
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 1,624,458 1,636,041
Investments 1,725 1,836
Derivative Assets 116,772 [1] 142,042 [2]
Total Assets 2,531,508 2,362,576
Financial instruments sold, but not yet purchased, at fair value 255,221 183,093
Derivative contracts, Liabilities 116,758 [3] 142,028 [11]
Total, Liabilities 371,979 325,121
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 157,385 73,608
Available-for-sale securities 2,189 2,148
Financial instruments sold, but not yet purchased, at fair value 29,110 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 44,567 6,091
Available-for-sale securities 209,540 207,725
Level 2 [Member] | Corporate Fixed Income Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 203,063 201,480
Available-for-sale securities 550,322 566,294
Financial instruments sold, but not yet purchased, at fair value 175,161 134,293
Level 2 [Member] | Corporate Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 260 746
Investments 1,680 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 101,033 126,237
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 45 [5] 0
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 276,964 172,642
Available-for-sale securities 792,969 791,022
Financial instruments sold, but not yet purchased, at fair value 50,768 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 66,695 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 392 388
Level 2 [Member] | Sovereign Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 788,553 582,657
Level 2 [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 5,281 [7] 1,853 [8]
Investments [6]   45
Financial instruments sold, but not yet purchased, at fair value 182 [9] 36 [10]
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0  
Investments 63,926 63,533
Derivative Assets [1] 0  
Total Assets 159,641 135,600
Financial instruments sold, but not yet purchased, at fair value 5,889 5,781
Total, Liabilities 5,889 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 2,124 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] | Auction Rate Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 14,680 14,681
Level 3 [Member] | Other Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [5] 37,368  
Level 3 [Member] | Sovereign Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 95,715 72,067
Level 3 [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 93,591 [7] 69,888 [8]
Investments [6]   36,974
Financial instruments sold, but not yet purchased, at fair value $ 5,889 [9] $ 5,781 [10]
[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] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[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.
[9] Includes syndicated loans and sovereign debt.
[10] Includes syndicated loans and state and municipal securities
[11] Included in accounts payable and accrued expenses in the consolidated statements of financial condition.