Financial Highlights (Net Investment Income Ratio To Average Equity) (Details)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Financial Highlights [Abstract]
Net Investment Income	9.07%	[1],[2],[3]	9.41%	[1],[2],[3]

[1] Includes all items of income and expense on an annualized basis except for incentive fee expense which is included on a non-annualized basis.

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

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