Income Tax Considerations (Schedule Of Cash Dividends Distributed To Common Shareholders) (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Ordinary income	42.20%	23.00%	80.70%
Capital gain distributions	57.80%	77.00%	19.30%
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