Financial Highlights (Expense Ratios To Average Equity) (Details)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Financial Highlights [Abstract]
Operating expenses before incentive fee, interest expense, and other investment related expenses	(2.81%)	[1],[2]	(2.81%)	[1],[2]
Ratio Of Incentive Fee To Average Equity	0.00%	[1],[2]	(0.39%)	[1],[2]
Interest expense and other investment related expenses	(1.97%)	[1],[2]	(1.66%)	[1],[2]
Total Expenses	(4.78%)	[1],[2]	(4.86%)	[1],[2]

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

[2] Ratios are annualized except for the incentive fee which is not annualized.