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Related Party Transactions Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |
Receivable balance due from a direct wholly-owned subsidiary | $ 10,183 | $ 10,129
Joint Venture |  |
Related Party Transaction [Line Items] |  |
Asset Management Fees | 36 |
Receivable balance due from joint venture | $ 36 |

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