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Related Party Transactions - Revenue and Expenses (Details) - Pillarstone OP [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Property operation and maintenance
Related Party Transaction [Line Items]
Rent	$ (225)	$ (213)	$ (701)	$ (628)
Other revenues
Related Party Transaction [Line Items]
Property management fee income	145	228	456	693
Interest, dividend and other investment income
Related Party Transaction [Line Items]
Interest income	$ 0	$ 52	$ 0	$ 161

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