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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Revenue Concentration | The following table provides a summary for the relevant periods: SUMMARY OF REVENUE CONCENTRATION (Dollars in Thousands)
|  | Year ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
CDO asset management revenue and related service agreements |  | $ | 21,729 |  |  | $ | 19,055 |  |  | $ | 19,850 |
Total asset management revenue |  | $ | 23,172 |  |  | $ | 21,698 |  |  | $ | 25,281 |
Total revenues |  | $ | 95,240 |  |  | $ | 100,331 |  |  | $ | 125,552 |
CDO asset management % as compared to total asset management fees |  |  | 94 | % |  |  | 88 | % |  |  | 79 | %
CDO asset management % as compared to total revenues |  |  | 23 | % |  |  | 19 | % |  |  | 16 | %
Number of CDOs generating management fees |  |  | 25 |  |  |  | 26 |  |  |  | 34 |

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- Definition Concentrations of Revenues [Table Text Block] + References No definition available. + Details
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