Stockholders' Equity (Tax Status of Distributions) (Details) - Common Stock - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Total Distributions Per Share (in usd per share)	$ 1.130000	$ 1.020000	$ 0.960000
Unrecaptured Section 1250 Gain (in usd per share)	0	0	0.282088
Nondividend Distributions (in usd per share)	0	0	0
AMT Adjustment (in usd per share)	0	0	0.071024
Ordinary Dividends
Class of Stock [Line Items]
Total Distributions Per Share (in usd per share)	0.983133	1.005584	0.373248
Long-Term Capital Gain
Class of Stock [Line Items]
Total Distributions Per Share (in usd per share)	$ 0.146867	$ 0.014416	$ 0.586752