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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, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned $ 694,028 $ 972,932
Available-for-sale securities 2,230,297 3,254,737
Investments 113,862 79,972
Cash equivalents measured at NAV 34,192 25,734
Derivative contracts, Assets [1]   1,086
Total Assets 3,072,379 4,334,461
Financial instruments sold, but not yet purchased, at fair value 437,978 662,852
U.S. Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 46,900 9,266
Financial instruments sold, but not yet purchased, at fair value 91,974 243,570
U.S. Government Agency Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 56,450 66,881
Available-for-sale securities 4,361 5,067
Corporate Fixed Income Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 194,575 250,783
Available-for-sale securities 631,758 675,311
Financial instruments sold, but not yet purchased, at fair value 162,626 140,100
Corporate Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 67,593 64,009
Investments 29,496 35,083
Financial instruments sold, but not yet purchased, at fair value 30,848 32,047
State And Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 96,150 137,211
Available-for-sale securities 2,453 24,297
Asset-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 698,133 1,592,889
Other Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 59,048 16,771
Investments in Funds and Partnerships Measured at NAV [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 12,385 13,221
Agency Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 216,434  
Agency Mortgage-Backed Securities [Member] | Agency Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned   388,856
Available-for-sale securities 793,410 837,878
Financial instruments sold, but not yet purchased, at fair value 141,227 231,909
Agency Mortgage-Backed Securities [Member] | Commercial [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 95,613 109,537
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 4,569 9,758
Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned [2] 15,926 55,926
Financial instruments sold, but not yet purchased, at fair value 11,303 [3] 15,226 [4]
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 114,353 71,717
Investments 39,838 43,928
Total Assets 154,191 115,645
Financial instruments sold, but not yet purchased, at fair value 126,916 276,250
Level 1 [Member] | U.S. Government Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 46,900 9,266
Financial instruments sold, but not yet purchased, at fair value 91,974 243,570
Level 1 [Member] | Corporate Fixed Income Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 4,474 872
Financial instruments sold, but not yet purchased, at fair value 4,094 633
Level 1 [Member] | Corporate Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 62,979 61,579
Investments 29,496 34,023
Financial instruments sold, but not yet purchased, at fair value 30,848 32,047
Level 1 [Member] | Other Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 10,342 9,905
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 568,391 891,889
Available-for-sale securities 2,230,297 3,254,737
Investments 6,593 6,483
Derivative contracts, Assets [1]   1,086
Total Assets 2,805,281 4,154,195
Financial instruments sold, but not yet purchased, at fair value 311,062 385,647
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 56,450 66,881
Available-for-sale securities 4,361 5,067
Level 2 [Member] | Corporate Fixed Income Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 190,101 249,911
Available-for-sale securities 631,758 675,311
Financial instruments sold, but not yet purchased, at fair value 158,532 139,467
Level 2 [Member] | Corporate Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 4,614 2,430
Level 2 [Member] | State And Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 96,150 137,211
Available-for-sale securities 2,453 24,297
Level 2 [Member] | Asset-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 698,133 1,592,889
Level 2 [Member] | Other Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 6,593 6,013
Level 2 [Member] | Agency Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 216,434  
Level 2 [Member] | Agency Mortgage-Backed Securities [Member] | Agency Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned   388,856
Available-for-sale securities 793,410 837,878
Financial instruments sold, but not yet purchased, at fair value 141,227 231,909
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 95,613 109,537
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 4,569 9,758
Level 2 [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned [2] 4,642 46,600
Financial instruments sold, but not yet purchased, at fair value 11,303 [3] 14,271 [4]
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned 11,284 9,326
Investments 55,046 16,340
Total Assets 66,330 25,666
Financial instruments sold, but not yet purchased, at fair value   955
Level 3 [Member] | Corporate Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   1,060
Level 3 [Member] | Other Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 42,113 853
Level 3 [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments owned [2] $ 11,284 9,326
Financial instruments sold, but not yet purchased, at fair value [4]   $ 955
[1] Included in other assets in the consolidated statements of financial condition.
[2] Includes loans, asset-backed securities, sovereign debt, and non-agency mortgage-backed securities.
[3] Includes sovereign debt and state and municipal securities.
[4] Includes sovereign debt, U.S. government agency securities, and loans.