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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Investments [Member]    
Assets    
Assets $ 5,040,804 $ 4,729,270
Financing Receivable [Member]    
Assets    
Assets 5,698 5,725
Fair Value, Measurements, Recurring [Member]    
Liabilities    
Liabilities 167  
Fair Value, Measurements, Recurring [Member] | Call Option [Member]    
Liabilities    
Liabilities $ 167 $ 0