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Fair Value Disclosures (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Significant Unobservable Inputs (Level 3) [Member] - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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CLOs [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | $ 3,135,000 | $ 4,485,000
Measurement Input |  | 2.0
CLOs [Member] | Yield [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Input | 9.7 | 11.8
CLOs [Member] | Yield [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Input | 12.2 | 19.1
CLOs [Member] | Yield [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Input | 11.1 | 13.8
CLOs [Member] | Duration [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Term | 6 years 9 months 18 days | 4 years 3 months 18 days
CLOs [Member] | Duration [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Term | 8 years | 4 years 6 months
CLOs [Member] | Duration [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Term | 7 years 3 months 18 days | 4 years 4 months 24 days
CLOs [Member] | Default Rate [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Input | 2 |
CLOs [Member] | Default Rate [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Input | 2 |
CLOs [Member] | Default Rate [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Input | 2.0 | 2.0
Equity securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value |  | $ 2,066,000
Equity securities [Member] | EBITDA Multiple [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Input |  | 7.6
Equity securities [Member] | EBITDA Multiple [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Input |  | 9.2
Equity securities [Member] | EBITDA Multiple [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement Input |  | 8.00

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