Financial Highlights (Net Investment Income Ratio To Average Equity) (Details)	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Financial Highlights [Abstract]
Net Investment Income	9.00%	[1],[2]	10.72%	[1],[2]	8.83%	[1],[2]	10.84%	[1],[2]

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

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