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Financial Instruments (Schedule Of Other Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Investments [Line Items] |  |
Other investments, Amortized Cost | $ 30,352 | $ 16,576
Other investments, Carry Value | 30,063 | 12,867
Other investments, Unrealized Gain / (Loss) | (289) | (3,709)
EuroDekania [Member] |  |
Schedule of Investments [Line Items] |  |
Other investments, Amortized Cost | 4,506 | 4,827
Other investments, Carry Value | 1,609 | 1,143
Other investments, Unrealized Gain / (Loss) | (2,897) | (3,684)
U.S. Insurance Fund [Member] |  |
Schedule of Investments [Line Items] |  |
Other investments, Amortized Cost | 999 |
Other investments, Carry Value | 1,006 |
Other investments, Unrealized Gain / (Loss) | 7 |
SPAC Fund [Member] |  |
Schedule of Investments [Line Items] |  |
Other investments, Amortized Cost | 600 |
Other investments, Carry Value | 602 |
Other investments, Unrealized Gain / (Loss) | 2 |
Equity securities [Member] |  |
Schedule of Investments [Line Items] |  |
Other investments, Amortized Cost | 10,290 | 7,126
Other investments, Carry Value | 12,057 | 7,132
Other investments, Unrealized Gain / (Loss) | 1,767 | 6
CLOs [Member] |  |
Schedule of Investments [Line Items] |  |
Other investments, Amortized Cost | 13,724 | 4,362
Other investments, Carry Value | 14,430 | 4,485
Other investments, Unrealized Gain / (Loss) | 706 | 123
CDOs [Member] |  |
Schedule of Investments [Line Items] |  |
Other investments, Amortized Cost | 189 | 189
Other investments, Carry Value | 26 | 26
Other investments, Unrealized Gain / (Loss) | (163) | (163)
Derivatives [Member] |  |
Schedule of Investments [Line Items] |  |
Other investments, Carry Value |  | (251)
Other investments, Unrealized Gain / (Loss) |  | (251)
Residential Loans [Member] |  |
Schedule of Investments [Line Items] |  |
Other investments, Amortized Cost | 44 | 72
Other investments, Carry Value | 330 | 358
Other investments, Unrealized Gain / (Loss) | 286 | 286
Foreign currency forward contracts [Member] |  |
Schedule of Investments [Line Items] |  |
Other investments, Carry Value | 3 | (26)
Other investments, Unrealized Gain / (Loss) | $ 3 | $ (26)

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