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Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | $ 1,297,491 | $ 1,267,449
Available-for-sale securities | 3,003,767 | 3,070,447
Investments | 70,225 | 67,982
Cash equivalents measured at NAV | 20,691 | 19,719
Derivative contracts, Assets | 4,896 | 7,683
Total Assets | 4,397,070 | 4,433,280
Financial instruments sold, but not yet purchased, at fair value | 979,116 | 947,306
Sovereign Debt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 2,351 | 14,063
Financial instruments sold, but not yet purchased, at fair value | 1,599 | 11,429
U.S. Government Agency Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 117,701 | 72,532
Available-for-sale securities | 5,368 | 5,215
Financial instruments sold, but not yet purchased, at fair value | 49 | 32,755
Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 56,514 | 25,905
Available-for-sale securities | 1,713,751 | 1,764,060
Corporate Fixed Income Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 336,317 | 310,457
Available-for-sale securities | 947,588 | 931,604
Financial instruments sold, but not yet purchased, at fair value | 195,642 | 208,725
Corporate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 54,779 | 57,911
Investments | 37,264 | 33,046
Financial instruments sold, but not yet purchased, at fair value | 53,182 | 36,117
State And Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 179,626 | 154,622
Available-for-sale securities | 49,118 | 68,226
Financial instruments sold, but not yet purchased, at fair value |  | 7
Auction Rate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 16,632 | 16,632
Auction Rate Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 704 | 704
Other Investment [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 1,028 | 1,041
Investments In Funds Measured At NAV [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 14,597 | 16,559
U.S. Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 27,326 | 42,121
Financial instruments sold, but not yet purchased, at fair value | 548,357 | 534,817
Mortgage Backed Securities [Member] | Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 514,718 | 564,111
Available-for-sale securities | 215,417 | 230,408
Financial instruments sold, but not yet purchased, at fair value | 180,287 | 123,456
Mortgage Backed Securities [Member] | Non-Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 8,159 | 25,727
Available-for-sale securities | 1,148 | 1,219
Mortgage Backed Securities [Member] | Commercial [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 71,377 | 69,715
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 83,983 | 100,346
Available-for-sale securities | 418 | 417
Investments | 36,077 | 31,670
Total Assets | 120,478 | 132,433
Financial instruments sold, but not yet purchased, at fair value | 601,808 | 571,504
Level 1 [Member] | U.S. Government Agency Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 418 | 417
Level 1 [Member] | Corporate Fixed Income Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 1,946 | 1,100
Financial instruments sold, but not yet purchased, at fair value | 269 | 1,289
Level 1 [Member] | Corporate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 54,711 | 57,125
Investments | 36,077 | 31,670
Financial instruments sold, but not yet purchased, at fair value | 53,182 | 35,398
Level 1 [Member] | U.S. Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 27,326 | 42,121
Financial instruments sold, but not yet purchased, at fair value | 548,357 | 534,817
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 1,213,333 | 1,166,927
Available-for-sale securities | 3,003,349 | 3,070,030
Investments | 1,362 | 1,560
Derivative contracts, Assets | 4,896 | 7,683
Total Assets | 4,222,940 | 4,246,200
Financial instruments sold, but not yet purchased, at fair value | 377,308 | 375,802
Level 2 [Member] | Sovereign Debt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 2,351 | 14,063
Financial instruments sold, but not yet purchased, at fair value | 1,599 | 11,429
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 | 117,701 | 72,532
Available-for-sale securities | 4,950 | 4,798
Financial instruments sold, but not yet purchased, at fair value | 49 | 32,755
Level 2 [Member] | Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 56,339 | 25,730
Available-for-sale securities | 1,713,751 | 1,764,060
Level 2 [Member] | Corporate Fixed Income Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 334,371 | 309,357
Available-for-sale securities | 947,588 | 931,604
Financial instruments sold, but not yet purchased, at fair value | 195,373 | 207,436
Level 2 [Member] | Corporate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 68 | 786
Investments | 1,187 | 1,376
Financial instruments sold, but not yet purchased, at fair value |  | 719
Level 2 [Member] | State And Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 179,626 | 154,622
Available-for-sale securities | 49,118 | 68,226
Financial instruments sold, but not yet purchased, at fair value |  | 7
Level 2 [Member] | Other Investment [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 175 | 184
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 | 514,718 | 564,111
Available-for-sale securities | 215,417 | 230,408
Financial instruments sold, but not yet purchased, at fair value | 180,287 | 123,456
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 | 8,159 | 25,726
Available-for-sale securities | 1,148 | 1,219
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 | 71,377 | 69,715
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 175 | 176
Investments | 18,189 | 18,193
Total Assets | 18,364 | 18,369
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] | Auction Rate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 16,632 | 16,632
Level 3 [Member] | Auction Rate Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 704 | 704
Level 3 [Member] | Other Investment [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | $ 853 | 857
Level 3 [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

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