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Income Tax Considerations (Schedule Of Cash Dividends Distributed To Common Shareholders) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Ordinary income 92.70% 54.00% 50.50%
Capital gain distributions 4.30% 46.00% 49.50%
Return of capital (nontaxable distribution) 3.00% 0.00% 0.00%
Total 100.00% 100.00% 100.00%