Financial Highlights (Net Investment Income Ratio To Average Equity) (Details)	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Financial Highlights [Abstract]
Net Investment Income	9.99%	[1],[2]	7.04%	[1],[2]	8.89%	[1],[2]	7.65%	[1],[2]

[1] Includes incentive fee in calculation which can vary substantially over periods.

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