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Fair Value Disclosures (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | $ 219,462 | $ 202,257
Other investments, measured using hierarchy |  | 26,846 | 11,724
Other investments, Carrying Value |  | 30,063 | 12,867
Trading securities sold, not yet purchased |  | 81,220 | 91,887
Quoted Prices In Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 4,205 | 2,555
Other investments, measured using hierarchy |  | 11,211 | 7,106
Trading securities sold, not yet purchased |  | 42,015 | 62,798
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 215,257 | 197,636
Other investments, measured using hierarchy |  | 12,474 | 107
Trading securities sold, not yet purchased |  | 39,205 | 29,089
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  |  | 2,066
Other investments, measured using hierarchy |  | 3,161 | 4,511
Investments Measured At NAV [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, at fair value | [1] | 3,217 | 1,143
U.S. government agency MBS and CMOs [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 62,497 | 87,608
Trading securities sold, not yet purchased |  | 17 |
U.S. government agency MBS and CMOs [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 62,497 | 87,608
Trading securities sold, not yet purchased |  | 17 |
U.S. government agency debt securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 14,537 | 13,529
U.S. government agency debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 14,537 | 13,529
RMBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 16 | 32
RMBS [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 16 | 32
U.S. Treasury securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 4,139 | 2,466
Trading securities sold, not yet purchased |  | 42,015 | 62,798
U.S. Treasury securities [Member] | Quoted Prices In Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 4,139 | 2,466
Trading securities sold, not yet purchased |  | 42,015 | 62,798
ABS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 100 | 1
ABS [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 100 | 1
SBA loans [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 57,596 | 4,780
SBA loans [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 57,596 | 4,780
Corporate bonds and redeemable preferred stock [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 49,945 | 43,435
Trading securities sold, not yet purchased |  | 34,462 | 28,445
Corporate bonds and redeemable preferred stock [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 49,945 | 43,435
Trading securities sold, not yet purchased |  | 34,462 | 28,445
Foreign government bonds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 232 | 483
Foreign government bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 232 | 483
Municipal bonds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 24,139 | 45,709
Trading securities sold, not yet purchased |  | 20 | 37
Municipal bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 24,139 | 45,709
Trading securities sold, not yet purchased |  | 20 | 37
Certificates of deposit [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 918 |
Certificates of deposit [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 918 |
Derivatives [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 5,277 | 1,118
Other investments, Carrying Value |  |  | (251)
Trading securities sold, not yet purchased |  | 4,706 | 607
Derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 5,277 | 1,118
Trading securities sold, not yet purchased |  | 4,706 | 607
Equity securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 66 | 3,096
Other investments, measured using hierarchy |  | 12,057 | 7,132
Other investments, Carrying Value |  | 12,057 | 7,132
Equity securities [Member] | Quoted Prices In Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  | 66 | 89
Other investments, measured using hierarchy |  | 11,208 | 7,132
Equity securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  |  | 941
Other investments, measured using hierarchy |  | 849 |
Equity securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total investments-trading |  |  | 2,066
CLOs [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, measured using hierarchy |  | 14,430 | 4,485
CLOs [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, measured using hierarchy |  | 11,295 |
CLOs [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, measured using hierarchy |  | 3,135 | 4,485
CDOs [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, measured using hierarchy |  | 26 | 26
CDOs [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, measured using hierarchy |  | 26 | 26
Derivatives [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, measured using hierarchy |  |  | (251)
Derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, measured using hierarchy |  |  | (251)
Residential Loans [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, measured using hierarchy |  | 330 | 358
Residential Loans [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, measured using hierarchy |  | 330 | 358
Foreign currency forward contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, measured using hierarchy |  | 3 | (26)
Foreign currency forward contracts [Member] | Quoted Prices In Active Markets (Level 1) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, measured using hierarchy |  | 3 | (26)
EuroDekania [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments, Carrying Value |  | $ 1,609 | $ 1,143
[1] | As a practical expedient, the Company uses NAV or its equivalent to measure the fair value of its investments in EuroDekania, the U.S. Insurance JV, and the SPAC Fund. EuroDekania invests in hybrid capital securities of European companies. The U.S. Insurance JV invests in debt issued by small and medium sized U.S. and Bermuda insurance and reinsurance companies. The SPAC Fund invests in equity securities of SPACs. According to ASC 820, these investments are not categorized within the fair value hierarchy.

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