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Fair Value of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Liabilities |  |
Liabilities | $ 293,407 | $ 301,785
Investments [Member] |  |
Assets |  |
Investments | 3,554,236 | 3,380,642
Options Sold [Member] |  |
Liabilities |  |
Liabilities | 122 | 260
Total Return Swap [Member] |  |
Liabilities |  |
Liabilities | 3,285 | 11,525
Borrowings [Members] | Secured Debt [Member] |  |
Liabilities |  |
Liabilities | 140,000 | 140,000
Borrowings [Members] | Unsecured Debt [Member] |  |
Liabilities |  |
Liabilities | $ 150,000 | $ 150,000

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