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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | $ 1,157,004 |  | $ 694,028 |  |
Available-for-sale securities |  | 2,113,893 | [1] | 2,230,297 |  |
Investments |  | 117,804 |  | 113,862 |  |
Cash equivalents measured at NAV |  | 3,004 |  | 34,192 |  |
Derivative contracts, Assets | [2] | 52,129 |  |  |  |
Total Assets |  | 3,443,834 |  | 3,072,379 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 756,150 |  | 437,978 |  |
Derivative contracts, Liabilities | [3] | 52,147 |  |  |  |
Total Liabilities |  | 808,297 |  |  |  |
U.S. Government Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 10,774 |  | 46,900 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 377,023 |  | 91,974 |  |
U.S. Government Agency Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 143,793 |  | 56,450 |  |
Available-for-sale securities |  | 1,808 | [1] | 4,361 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 37,395 |  |  |  |
Asset-Backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 132,087 |  | 3,394 |  |
Available-for-sale securities |  | 291,054 | [1] | 698,133 |  |
Corporate Fixed Income Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 255,999 |  | 194,575 |  |
Available-for-sale securities |  | 791,893 | [1] | 631,758 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 153,852 |  | 162,626 |  |
Corporate Equity Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 75,056 |  | 67,593 |  |
Investments |  | 21,308 |  | 29,496 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 28,482 |  | 30,848 |  |
State And Municipal Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 162,335 |  | 96,150 | [4] |
Available-for-sale securities |  | 2,399 | [1] | 2,453 |  |
Auction Rate Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments |  | 13,032 |  | 12,933 |  |
Other Investment [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments |  | 60,406 |  | 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 |  | 23,058 |  | 12,385 |  |
Mortgage-Backed Securities [Member] | Agency Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 335,050 |  | 216,434 |  |
Available-for-sale securities |  | 952,186 | [1] | 793,410 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 156,628 |  | 141,227 |  |
Mortgage-Backed Securities [Member] | Commercial [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities |  | 73,985 | [1] | 95,613 |  |
Mortgage-Backed Securities [Member] | Non-Agency [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities |  | 568 | [1] | 4,569 |  |
Sovereign Debt [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments sold, but not yet purchased, at fair value |  | 2,770 |  |  |  |
Other [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 41,910 | [5] | 12,532 |  |
Financial instruments sold, but not yet purchased, at fair value | [6] |  |  | 11,303 |  |
Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 84,450 |  | 114,353 |  |
Investments |  | 24,110 |  | 39,838 |  |
Total Assets |  | 108,560 |  | 154,191 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 405,505 |  |  |  | $ 126,916
Total Liabilities |  | 405,505 |  |  |  |
Level 1 [Member] | U.S. Government Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 10,774 |  | 46,900 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 377,023 |  |  |  | 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 |  | 183 |  | 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 |  | 73,493 |  | 62,979 |  |
Investments |  | 13,893 |  | 29,496 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 28,482 |  |  |  | $ 30,848
Level 1 [Member] | Other Investment [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments |  | 10,217 |  | 10,342 |  |
Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 980,766 |  | 568,391 |  |
Available-for-sale securities |  | 2,113,893 |  | 2,230,297 |  |
Investments |  | 16,013 |  | 6,593 |  |
Derivative contracts, Assets | [2] | 52,129 |  |  |  |
Total Assets |  | 3,162,801 |  | 2,805,281 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 350,645 |  | 311,062 |  |
Derivative contracts, Liabilities | [3] | 52,147 |  |  |  |
Total Liabilities |  | 402,792 |  |  |  |
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 |  | 143,793 |  | 56,450 |  |
Available-for-sale securities |  | 1,808 |  | 4,361 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 37,395 |  |  |  |
Level 2 [Member] | Asset-Backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 67,381 |  | 3,385 |  |
Available-for-sale securities |  | 291,054 |  | 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 |  | 255,816 |  | 190,101 |  |
Available-for-sale securities |  | 791,893 |  | 631,758 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 153,852 |  | 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 |  | 1,338 |  | 4,614 |  |
Investments |  | 1,661 |  |  |  |
Level 2 [Member] | State And Municipal Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 162,335 |  | 96,150 | [4] |
Available-for-sale securities |  | 2,399 |  | 2,453 |  |
Level 2 [Member] | Other Investment [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments |  | 14,352 |  | 6,593 |  |
Level 2 [Member] | Mortgage-Backed Securities [Member] | Agency Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 335,050 |  | 216,434 |  |
Available-for-sale securities |  | 952,186 |  | 793,410 |  |
Financial instruments sold, but not yet purchased, at fair value |  | 156,628 |  | 141,227 |  |
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 |  | 73,985 |  | 95,613 |  |
Level 2 [Member] | Mortgage-Backed Securities [Member] | Non-Agency [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities |  | 568 |  | 4,569 |  |
Level 2 [Member] | Sovereign Debt [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments sold, but not yet purchased, at fair value |  | 2,770 |  |  |  |
Level 2 [Member] | Other [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 15,053 | [5] | 1,257 |  |
Financial instruments sold, but not yet purchased, at fair value | [6] |  |  | 11,303 |  |
Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 91,788 |  | 11,284 |  |
Investments |  | 54,623 |  | 55,046 |  |
Total Assets |  | 146,411 |  | 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 |  | 64,706 |  | 9 |  |
Level 3 [Member] | Corporate Equity Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | 225 |  |  |  |
Investments |  | 5,754 |  |  |  |
Level 3 [Member] | Auction Rate Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments |  | 13,032 |  | 12,933 |  |
Level 3 [Member] | Other Investment [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments |  | 35,837 |  | 42,113 |  |
Level 3 [Member] | Other [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financial instruments owned |  | $ 26,857 | [5] | $ 11,275 |  |
[1] | Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[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] | Includes loans, sovereign debt, and non-agency mortgage-backed securities.
[5] | Includes loans, non-agency mortgage-backed securities, and sovereign debt.
[6] | Includes sovereign debt and state and municipal securities.

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