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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investments [Member] |  |
Assets |  |
Assets | $ 4,729,270 | $ 4,312,161
Notes Receivable [Member] |  |
Assets |  |
Assets | 5,725 | 5,665
Equity Contract [Member] |  |
Liabilities |  |
Derivative liabilitly | 0 | 77
Unsecured Debt [Member] | Borrowings [Member] |  |
Liabilities |  |
Notes payable, fair value | $ 415,253 | $ 394,279

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