Income Tax Considerations (Schedule Of Cash Dividends Distributed To Common Shareholders) (Details)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Ordinary income	80.70%	92.70%	54.00%
Capital gain distributions	19.30%	4.30%	46.00%
Return of capital (nontaxable distribution)	0.00%	3.00%	0.00%
Total	100.00%	100.00%	100.00%

Percentage of ordinary income and capital gain distributions

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration