Summary of Significant Accounting Policies - Schedule of Variable Interest Entities (Details) - Operating Partnership - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Total assets	$ 292,525	$ 349,467
Total liabilities	166,913	202,141
Property, net
Variable Interest Entity [Line Items]
Total assets	264,946	288,881
Other assets
Variable Interest Entity [Line Items]
Total assets	27,579	60,586
Mortgage notes payable
Variable Interest Entity [Line Items]
Total liabilities	126,279	129,436
Other liabilities
Variable Interest Entity [Line Items]
Total liabilities	$ 40,634	$ 72,705