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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Investments [Member]    
Assets    
Assets $ 5,074,754 $ 4,729,270
Financing Receivable [Member]    
Assets    
Assets 5,741 5,725
Fair Value, Measurements, Recurring [Member]    
Liabilities    
Liabilities 473  
Fair Value, Measurements, Recurring [Member] | Call Option [Member]    
Liabilities    
Liabilities $ 473 $ 0