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Income Tax Considerations (Schedule Of Cash Dividends Distributed To Common Shareholders) (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Ordinary income 65.40% 42.20% 23.00%
Capital gain distributions 34.60% 57.80% 77.00%
Total 100.00% 100.00% 100.00%