Income Taxes (Summary of Distributions Paid) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common Shares, Ordinary income, Amount
Common Shares, Capital gain, Amount
Common Shares, Return of capital, Amount		0.585000
Common Shares, Total, Amount	$ 0	$ 0.585000
Common Shares, Ordinary income, Percent
Common Shares, Capital gain, Percent
Common Shares, Return of capital, Percent		100.00%
Common Shares, Total, Percent		100.00%
Preferred Shares, Total, Amount	$ 0
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Shares, Ordinary income, Amount
Preferred Shares, Capital gain, Amount
Preferred Shares, Return of capital, Amount		0.468750
Preferred Shares, Total, Amount		$ 0.468750
Preferred Shares, Ordinary income, Percent
Preferred Shares, Capital gain, Percent
Preferred Shares, Return of capital, Percent		100.00%
Preferred Shares, Total, Percent		100.00%