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Fair Value of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Liabilities |  |
Liabilities fair value | $ 1,323 | $ 785
Investments [Member] |  |
Assets |  |
Assets | 3,732,728 | 3,547,560
Notes Receivable [Member] |  |
Assets |  |
Assets | 5,565 | 0
Total Return Swap [Member] |  |
Liabilities |  |
Liabilities fair value | 1,200 | 765
Equity Contract [Member] |  |
Liabilities |  |
Liabilities fair value | 123 | 20
Total Return Swap [Member] |  |
Assets |  |
Assets | 0 | 667
Secured Debt [Member] | Borrowings [Member] |  |
Liabilities |  |
Liabilities fair value | 0 | 140,000
Unsecured Debt [Member] |  |
Liabilities |  |
Liabilities fair value | 375,000 |
Unsecured Debt [Member] | Borrowings [Member] |  |
Liabilities |  |
Liabilities fair value | $ 385,583 | $ 180,000

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