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Income Taxes (Taxability of Cash Distributions Paid on Common Shares) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Taxability Of Cash Distributions Paid On Common Shares [Abstract]
Ordinary income (dollars per share)	$ 4.00	$ 3.51	$ 3.66
Return of capital (dollars per share)	0.00	0.21	0.02
Un-recaptured Section 1250 gain dividends per share	0.00	0.12	0.01
Total (dollars per share)	$ 4.00	$ 3.84	$ 3.69
Ordinary income (percentage per share)	99.98%	91.39%	99.26%
Return of capital (percentage per share)	0.02%	5.54%	0.61%
Un-recaptured Section 1250 gain dividends per share percentage	0.00%	3.07%	0.13%
Total (percentage per share)	100.00%	100.00%	100.00%