Stockholders' Equity - Tax Status of Distributions (Details) - Common Stock - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Total Distributions Per Share (in usd per share)	$ 1.190000	$ 1.130000	$ 1.020000
Unrecaptured Section 1250 Gain (in usd per share)	0.417166	0	0
Nondividend Distributions (in usd per share)	0	0	0
Section 199A Dividends (in usd per share)		0.983133	1.005584
Section 1061 One Year Amounts Disclosure (in usd per share)	0.320351	0	0
Section 1061 Three Year Amounts Disclosure (in usd per share)	0.320351	0	0
Ordinary Dividends
Class of Stock [Line Items]
Total Distributions Per Share (in usd per share)	0	0.983133	1.005584
Long-Term Capital Gain
Class of Stock [Line Items]
Total Distributions Per Share (in usd per share)	$ 1.190000	$ 0.146867	$ 0.014416