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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
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.