Financial Highlights (Expense Ratios To Average Equity) (Details)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Investment Company, Financial Highlights [Abstract]
Operating expenses, before interest expense and other investment related expenses	[1]	(2.86%)	(2.81%)
Incentive fee	[1]	(0.12%)	(0.00%)
Interest expense and other investment related expenses	[1]	(12.03%)	(6.41%)
Total Expenses	[1]	(15.01%)	(9.22%)

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