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Related Party Transactions - Narrative (Details) - Pillarstone OP [Member]
$ in Millions
Dec. 08, 2016
USD ($)
Related Party Transaction [Line Items]  
Financed receivable due from related party $ 15.4
Minimum [Member] | LIBOR Rate  
Related Party Transaction [Line Items]  
Financing receivable, basis spread on variable rate 1.40%
Maximum [Member] | LIBOR Rate  
Related Party Transaction [Line Items]  
Financing receivable, basis spread on variable rate 1.95%