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Fair Value of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Liabilities |  |
Liabilities | $ 1,690 | $ 785
Total Return Swap [Member] |  |
Assets |  |
Assets | 0 | 667
Investments [Member] |  |
Assets |  |
Assets | 3,600,498 | 3,547,560
Total Return Swap [Member] |  |
Liabilities |  |
Liabilities | 1,405 | 765
Borrowings [Member] | Secured Debt [Member] |  |
Liabilities |  |
Liabilities | 0 | 140,000
Borrowings [Member] | Unsecured debt [Member] |  |
Liabilities |  |
Liabilities | 374,633 | 180,000
Call Option [Member] |  |
Liabilities |  |
Liabilities | $ 285 | $ 20

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