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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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