Discontinued Operations - Schedule of Results of Operations Related to Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2020	Sep. 30, 2020
Expenses:
Income from discontinued operations, net		$ 2,147	$ 5,815
1899 Pennsylvania Avenue [Member]
Revenues:
Rental revenue	[1]	3,556	10,634
Other income	[1]	85	215
Total revenues	[1]	3,641	10,849
Expenses:
Operating	[1]	1,483	4,333
Depreciation and amortization	[1]		690
Total expenses	[1]	1,483	5,023
Income before income taxes	[1]	2,158	5,826
Income tax expense	[1]	(11)	(11)
Income from discontinued operations, net	[1]	$ 2,147	$ 5,815

[1] Represents revenues, expenses, net income and cash flow information of 1899 Pennsylvania Avenue, which was sold on December 24, 2020.