Income Taxes (Schedule of Per Share Distributions Reported to Shareholders) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Ordinary Income	$ 2.53	$ 2.99	$ 2.38
Long-term capital gain	0.46	0.09	0.41
Unrecaptured Sec. 1250 gain	0.21	0	0.21
Total common share distributions	$ 3.20	$ 3.08	$ 3.00