Summary of Significant Accounting Policies - Schedule of variable interest entities (Details) - Operating Partnership - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Total assets	$ 278,140	$ 286,512
Total liabilities	258,864	157,776
Property, net
Variable Interest Entity [Line Items]
Total assets	254,866	263,511
Other assets
Variable Interest Entity [Line Items]
Total assets	23,274	23,001
Mortgage notes payable
Variable Interest Entity [Line Items]
Total liabilities	222,085	125,273
Other liabilities
Variable Interest Entity [Line Items]
Total liabilities	$ 36,779	$ 32,503