Financial Highlights (Net Investment Income Ratio To Average Equity) (Details)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Financial Highlights [Abstract]
Net Investment Income	8.92%	[1],[2]	9.07%	[1],[2]

[1] Includes all items of income and expense on an annualized basis.

[2] Average equity is calculated using month end values.