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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, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned $ 1,199,386 $ 694,028
Available-for-sale securities 2,242,465 2,230,297
Investments 120,919 113,862
Cash equivalents measured at NAV 1,639 34,192
Total Assets 3,564,409 3,072,379
Financial instruments sold, but not yet purchased, at fair value 721,028 437,978
U.S. Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 16,829 46,900
Financial instruments sold, but not yet purchased, at fair value 366,014 91,974
U.S. Government Agency Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 182,636 56,450
Available-for-sale securities 2,268 4,361
Financial instruments sold, but not yet purchased, at fair value 44,638  
Asset-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 74,783  
Available-for-sale securities 323,932 698,133
Corporate Fixed Income Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 318,288 194,575
Available-for-sale securities 820,839 631,758
Financial instruments sold, but not yet purchased, at fair value 161,529 162,626
Corporate Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 91,874 67,593
Investments 25,198 29,496
Financial instruments sold, but not yet purchased, at fair value 30,813 30,848
State And Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 162,821 96,150
Available-for-sale securities 2,414 2,453
Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 18,854  
Other Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 60,745 59,048
Investments in Funds and Partnerships Measured at NAV [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 22,064 12,385
Agency Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned   216,434
Available-for-sale securities 1,016,730 793,410
Financial instruments sold, but not yet purchased, at fair value 109,887 141,227
Agency Mortgage-Backed Securities [Member] | Commercial [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 75,701 95,613
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 581 4,569
Agency Securities [Member] | Agency Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 303,684  
Non-Agency [Member] | Agency Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 19,697  
Sovereign Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 9,920  
Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned [1]   15,926
Financial instruments sold, but not yet purchased, at fair value 8,147 11,303 [2]
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 107,727 114,353
Investments 26,676 39,838
Total Assets 134,403 154,191
Financial instruments sold, but not yet purchased, at fair value 396,827 126,916
Level 1 [Member] | U.S. Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 16,829 46,900
Financial instruments sold, but not yet purchased, at fair value 366,014 91,974
Level 1 [Member] | Corporate Fixed Income Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 250 4,474
Financial instruments sold, but not yet purchased, at fair value   4,094
Level 1 [Member] | Corporate Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 90,648 62,979
Investments 16,443 29,496
Financial instruments sold, but not yet purchased, at fair value 30,813 30,848
Level 1 [Member] | Other Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 10,233 10,342
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 1,003,871 568,391
Available-for-sale securities 2,242,465 2,230,297
Investments 15,548 6,593
Total Assets 3,261,884 2,805,281
Financial instruments sold, but not yet purchased, at fair value 324,201 311,062
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 182,636 56,450
Available-for-sale securities 2,268 4,361
Financial instruments sold, but not yet purchased, at fair value 44,638  
Level 2 [Member] | Asset-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 5,849  
Available-for-sale securities 323,932 698,133
Level 2 [Member] | Corporate Fixed Income Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 318,038 190,101
Available-for-sale securities 820,839 631,758
Financial instruments sold, but not yet purchased, at fair value 161,529 158,532
Level 2 [Member] | Corporate Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 1,226 4,614
Investments 1,001  
Level 2 [Member] | State And Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 162,821 96,150
Available-for-sale securities 2,414 2,453
Level 2 [Member] | Other Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 14,547 6,593
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   216,434
Available-for-sale securities 1,016,730 793,410
Financial instruments sold, but not yet purchased, at fair value 109,887 141,227
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 75,701 95,613
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 581 4,569
Level 2 [Member] | Agency Securities [Member] | Agency Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 303,684  
Level 2 [Member] | Non-Agency [Member] | Agency Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 19,697  
Level 2 [Member] | Sovereign Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 9,920  
Level 2 [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned [1]   4,642
Financial instruments sold, but not yet purchased, at fair value 8,147 11,303 [2]
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 87,788 11,284
Investments 56,631 55,046
Total Assets 144,419 66,330
Level 3 [Member] | Asset-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 68,934  
Level 3 [Member] | Corporate Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 7,754  
Level 3 [Member] | Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 18,854  
Level 3 [Member] | Other Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 35,965 42,113
Level 3 [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned [1]   $ 11,284
[1] Includes loans, asset-backed securities, sovereign debt, and non-agency mortgage-backed securities.
[2] Includes sovereign debt and state and municipal securities.