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Fair Value of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Liabilities |  |
Liabilities fair value | $ 320,785 | $ 301,785
Investments [Member] |  |
Assets |  |
Assets fair value | 3,547,560 | 3,380,642
Total Return Swap [Member] |  |
Assets |  |
Assets fair value | 667 | 0
Liabilities |  |
Liabilities fair value | 765 | 11,525
Secured Debt [Member] | Borrowings [Member] |  |
Liabilities |  |
Liabilities fair value | 140,000 | 140,000
Unsecured Debt [Member] | Borrowings [Member] |  |
Liabilities |  |
Liabilities fair value | 180,000 | 150,000
Options Sold [Member] |  |
Liabilities |  |
Liabilities fair value | $ 20 | $ 260

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