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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investments [Member] |  |
Assets |  |
Assets | $ 4,312,161 | $ 3,768,091
Notes Receivable [Member] |  |
Assets |  |
Assets | 5,665 | 5,557
Total Return Swap [Member] |  |
Liabilities |  |
Liabilities fair value | 0 | 4,851
Equity Contract [Member] |  |
Liabilities |  |
Derivative liabilitly | 77 | 3
Unsecured Debt [Member] | Borrowings [Member] |  |
Liabilities |  |
Notes payable, fair value | $ 394,279 | $ 362,674

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