Summary of Significant Accounting Policies - Schedule of variable interest entities (Details) - Operating Partnership - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Total assets	$ 273,764	$ 286,512
Total liabilities	254,092	157,776
Property, net
Variable Interest Entity [Line Items]
Total assets	253,953	263,511
Other assets
Variable Interest Entity [Line Items]
Total assets	19,811	23,001
Mortgage notes payable
Variable Interest Entity [Line Items]
Total liabilities	222,284	125,273
Other liabilities
Variable Interest Entity [Line Items]
Total liabilities	$ 31,808	$ 32,503