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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, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | $ 1,181,047 | $ 1,143,684
Available-for-sale securities | 3,712,801 | 3,773,508
Investments | 98,920 | 111,379
Cash equivalents measured at NAV | 17,397 | 77,441
Derivative contracts, Assets | 11,606 | 7,995
Total Assets | 5,021,771 | 5,114,007
Financial instruments sold, but not yet purchased, at fair value | 959,535 | 778,863
Sovereign Debt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 19,341 | 32,470
Financial instruments sold, but not yet purchased, at fair value | 23,575 | 20,236
U.S. Government Agency Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 111,921 | 147,223
Available-for-sale securities | 5,026 | 4,983
Financial instruments sold, but not yet purchased, at fair value | 20,618 | 10,348
Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 85,987 | 76,752
Available-for-sale securities | 2,001,222 | 2,106,938
Corporate Fixed Income Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 364,917 | 325,471
Available-for-sale securities | 1,281,095 | 1,211,442
Financial instruments sold, but not yet purchased, at fair value | 223,865 | 180,755
Corporate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 39,090 | 46,802
Investments | 47,287 | 49,978
Financial instruments sold, but not yet purchased, at fair value | 20,235 | 38,510
State And Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 147,876 | 169,699
Available-for-sale securities | 69,865 | 70,559
Auction Rate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 25,287 | 34,789
Auction Rate Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 847 | 846
Other Investment [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 1,218 | 1,217
Investments In Funds Measured At NAV [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 24,281 | 24,549
U.S. Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 21,087 | 13,466
Financial instruments sold, but not yet purchased, at fair value | 527,073 | 442,402
Mortgage Backed Securities [Member] | Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 361,747 | 302,445
Available-for-sale securities | 283,703 | 305,530
Financial instruments sold, but not yet purchased, at fair value | 144,169 | 86,612
Mortgage Backed Securities [Member] | Non-Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 29,081 | 29,356
Available-for-sale securities | 1,441 | 1,568
Mortgage Backed Securities [Member] | Commercial [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 70,449 | 72,488
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 60,365 | 60,239
Available-for-sale securities | 515 | 516
Investments | 47,287 | 49,978
Total Assets | 108,167 | 110,733
Financial instruments sold, but not yet purchased, at fair value | 547,292 | 480,472
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 | 515 | 516
Level 1 [Member] | Corporate Fixed Income Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 616 | 362
Level 1 [Member] | Corporate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 38,662 | 46,411
Investments | 47,287 | 49,978
Financial instruments sold, but not yet purchased, at fair value | 20,219 | 38,070
Level 1 [Member] | U.S. Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 21,087 | 13,466
Financial instruments sold, but not yet purchased, at fair value | 527,073 | 442,402
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 1,119,775 | 1,082,592
Available-for-sale securities | 3,712,286 | 3,772,992
Investments | 361 | 360
Derivative contracts, Assets | 11,606 | 7,995
Total Assets | 4,844,028 | 4,863,939
Financial instruments sold, but not yet purchased, at fair value | 412,243 | 298,391
Level 2 [Member] | Sovereign Debt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 19,341 | 32,470
Financial instruments sold, but not yet purchased, at fair value | 23,575 | 20,236
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 | 111,921 | 147,223
Available-for-sale securities | 4,511 | 4,467
Financial instruments sold, but not yet purchased, at fair value | 20,618 | 10,348
Level 2 [Member] | Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 85,630 | 76,395
Available-for-sale securities | 2,001,222 | 2,106,938
Level 2 [Member] | Corporate Fixed Income Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 364,072 | 324,867
Available-for-sale securities | 1,281,095 | 1,211,442
Financial instruments sold, but not yet purchased, at fair value | 223,865 | 180,755
Level 2 [Member] | Corporate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 108 | 138
Financial instruments sold, but not yet purchased, at fair value | 16 | 440
Level 2 [Member] | State And Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 147,876 | 169,699
Available-for-sale securities | 69,865 | 70,559
Level 2 [Member] | Other Investment [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 361 | 360
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 | 361,747 | 302,445
Available-for-sale securities | 283,703 | 305,530
Financial instruments sold, but not yet purchased, at fair value | 144,169 | 86,612
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 | 29,080 | 29,355
Available-for-sale securities | 1,441 | 1,568
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 | 70,449 | 72,488
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 907 | 853
Investments | 26,991 | 36,492
Total Assets | 27,898 | 37,345
Level 3 [Member] | Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 357 | 357
Level 3 [Member] | Corporate Fixed Income Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 229 | 242
Level 3 [Member] | Corporate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments owned | 320 | 253
Level 3 [Member] | Auction Rate Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 25,287 | 34,789
Level 3 [Member] | Auction Rate Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 847 | 846
Level 3 [Member] | Other Investment [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 857 | 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 | $ 1

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