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Related Party Transactions - Schedule of fees charged to unconsolidated joint ventures (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Management fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues | $ 11,052 | $ 10,056 | $ 32,090 | $ 31,955
Unconsolidated Joint Ventures and Third Party Managed Properties |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues | 8,941 | 8,134 | 25,261 | 25,290
Unconsolidated Joint Ventures and Third Party Managed Properties | Management fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues | 4,971 | 4,749 | 14,366 | 13,914
Unconsolidated Joint Ventures and Third Party Managed Properties | Development and leasing fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues | $ 3,970 | $ 3,385 | $ 10,895 | $ 11,376

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