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Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | $ 846,218 | $ 972,932
Available-for-sale securities | 3,172,489 | 3,254,737
Investments | 95,407 | 79,972
Cash equivalents measured at NAV | 51,541 | 25,734
Derivative contracts, Assets |  | 1,086
Total Assets | 4,165,655 | 4,334,461
Financial instruments sold, but not yet purchased, at fair value | 598,322 | 662,852
Derivative contracts, Liabilities | 1,805 |
Total Liabilities | 600,127 |
Sovereign Debt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 19,976 | 12,403
Financial instruments sold, but not yet purchased, at fair value | 22,231 | 13,271
U.S. Government Agency Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 122,160 | 66,881
Available-for-sale securities | 5,146 | 5,067
Financial instruments sold, but not yet purchased, at fair value | 28,361 | 1,000
Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 7,843 | 28,385
Available-for-sale securities | 1,723,814 | 1,592,889
Financial instruments sold, but not yet purchased, at fair value | 675 |
Corporate Fixed Income Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 232,618 | 250,783
Available-for-sale securities | 557,969 | 675,311
Financial instruments sold, but not yet purchased, at fair value | 197,111 | 140,100
Corporate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 78,510 | 64,009
Investments | 21,586 | 35,083
Financial instruments sold, but not yet purchased, at fair value | 26,680 | 32,047
State And Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 123,546 | 137,211
Available-for-sale securities | 2,461 | 24,297
Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 9,611 | 9,983
Financial instruments sold, but not yet purchased, at fair value |  | 955
Auction Rate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 12,621 | 14,243
Auction Rate Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 183 | 654
Other Investment [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 50,333 | 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 | 10,684 | 13,221
U.S. Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 27,722 | 9,266
Financial instruments sold, but not yet purchased, at fair value | 208,591 | 243,570
Mortgage Backed Securities [Member] | Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 222,722 | 388,856
Available-for-sale securities | 770,729 | 837,878
Financial instruments sold, but not yet purchased, at fair value | 114,673 | 231,909
Mortgage Backed Securities [Member] | Non-Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 1,510 | 5,155
Available-for-sale securities | 6,923 | 9,758
Mortgage Backed Securities [Member] | Commercial [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 105,447 | 109,537
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 87,005 | 71,717
Investments | 29,819 | 43,928
Total Assets | 116,824 | 115,645
Financial instruments sold, but not yet purchased, at fair value | 235,459 | 276,250
Total Liabilities | 235,459 |
Level 1 [Member] | Corporate Fixed Income Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 2,062 | 872
Financial instruments sold, but not yet purchased, at fair value | 188 | 633
Level 1 [Member] | Corporate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 57,221 | 61,579
Investments | 20,526 | 34,023
Financial instruments sold, but not yet purchased, at fair value | 26,680 | 32,047
Level 1 [Member] | Other Investment [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 9,293 | 9,905
Level 1 [Member] | U.S. Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 27,722 | 9,266
Financial instruments sold, but not yet purchased, at fair value | 208,591 | 243,570
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 749,427 | 891,889
Available-for-sale securities | 3,172,489 | 3,254,737
Investments | 6,039 | 6,483
Derivative contracts, Assets |  | 1,086
Total Assets | 3,927,955 | 4,154,195
Financial instruments sold, but not yet purchased, at fair value | 362,863 | 385,647
Derivative contracts, Liabilities | 1,805 |
Total Liabilities | 364,668 |
Level 2 [Member] | Sovereign Debt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 19,976 | 12,403
Financial instruments sold, but not yet purchased, at fair value | 22,231 | 13,271
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 | 122,160 | 66,881
Available-for-sale securities | 5,146 | 5,067
Financial instruments sold, but not yet purchased, at fair value | 28,361 | 1,000
Level 2 [Member] | Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 7,668 | 28,210
Available-for-sale securities | 1,723,814 | 1,592,889
Financial instruments sold, but not yet purchased, at fair value | 675 |
Level 2 [Member] | Corporate Fixed Income Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 230,556 | 249,911
Available-for-sale securities | 557,969 | 675,311
Financial instruments sold, but not yet purchased, at fair value | 196,923 | 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 | 21,289 | 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 | 123,546 | 137,211
Available-for-sale securities | 2,461 | 24,297
Level 2 [Member] | Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned |  | 832
Level 2 [Member] | Auction Rate Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments |  | 470
Level 2 [Member] | Other Investment [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 6,039 | 6,013
Level 2 [Member] | Mortgage Backed Securities [Member] | Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 222,722 | 388,856
Available-for-sale securities | 770,729 | 837,878
Financial instruments sold, but not yet purchased, at fair value | 114,673 | 231,909
Level 2 [Member] | Mortgage Backed Securities [Member] | Non-Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 1,510 | 5,155
Available-for-sale securities | 6,923 | 9,758
Level 2 [Member] | Mortgage Backed Securities [Member] | Commercial [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 105,447 | 109,537
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 9,786 | 9,326
Investments | 48,865 | 16,340
Total Assets | 58,651 | 25,666
Financial instruments sold, but not yet purchased, at fair value |  | 955
Level 3 [Member] | Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 175 | 175
Level 3 [Member] | Corporate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 1,060 | 1,060
Level 3 [Member] | Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 9,611 | 9,151
Financial instruments sold, but not yet purchased, at fair value |  | 955
Level 3 [Member] | Auction Rate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 12,621 | 14,243
Level 3 [Member] | Auction Rate Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 183 | 184
Level 3 [Member] | Other Investment [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | $ 35,001 | $ 853

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