Income Taxes (Taxability of Cash Distributions Paid on Common Shares) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Taxability Of Cash Distributions Paid On Common Shares [Abstract]
Ordinary income (dollars per share)	$ 2.43	$ 4.00	$ 3.51
Return of capital (dollars per share)	1.36	0.00	0.21
Un-recaptured Section 1250 gain dividends per share	0.31	0.00	0.12
Total (dollars per share)	$ 4.10	$ 4.00	$ 3.84
Ordinary income (percentage per share)	59.18%	99.98%	91.39%
Return of capital (percentage per share)	33.15%	0.02%	5.54%
Un-recaptured Section 1250 gain dividends per share percentage	7.67%	0.00%	3.07%
Total (percentage per share)	100.00%	100.00%	100.00%