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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

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