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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Investments [Member]    
Assets    
Total assets, fair value $ 4,218,148 $ 3,768,091
Financing Receivable [Member]    
Assets    
Total assets, fair value 5,653 5,557
Fair Value, Measurements, Recurring [Member]    
Liabilities    
Liabilities, fair value 1,404 4,854
Fair Value, Measurements, Recurring [Member] | Call Option [Member]    
Liabilities    
Liabilities, fair value 237 3
Fair Value, Measurements, Recurring [Member] | Total Return Swap [Member]    
Liabilities    
Liabilities, fair value 1,167 4,851
Fair Value, Measurements, Recurring [Member] | Borrowings [Member] | Unsecured debt [Member]    
Liabilities    
Liabilities, fair value $ 394,129 $ 362,674