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Summary of Significant Accounting Policies - Schedule Operating Partnership's VIEs (Details) - Operating Partnership's VIEs - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Property, net |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 288,881 | $ 307,582
Other assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 60,586 | 68,863
Total assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 349,467 | 376,445
Mortgage notes payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 129,436 | 133,245
Other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 72,705 | 75,913
Total liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 202,141 | $ 209,158

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