Summary of Significant Accounting Policies - Schedule of variable interest entities (Details) - Operating Partnership - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Total assets	$ 287,344	$ 286,512
Total liabilities	157,391	157,776
Property, net
Variable Interest Entity [Line Items]
Total assets	261,610	263,511
Other assets
Variable Interest Entity [Line Items]
Total assets	25,734	23,001
Mortgage notes payable
Variable Interest Entity [Line Items]
Total liabilities	124,247	125,273
Other liabilities
Variable Interest Entity [Line Items]
Total liabilities	$ 33,144	$ 32,503