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Related Party Transactions - Schedule of fees charged to unconsolidated joint ventures (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Management fees |  |
Related Party Transaction [Line Items] |  |
Revenues | $ 10,180 | $ 10,542
Unconsolidated Joint Ventures and Third Party Managed Properties |  |
Related Party Transaction [Line Items] |  |
Revenues | 7,977 | 8,283
Unconsolidated Joint Ventures and Third Party Managed Properties | Management fees |  |
Related Party Transaction [Line Items] |  |
Revenues | 4,481 | 4,679
Unconsolidated Joint Ventures and Third Party Managed Properties | Development and leasing fees |  |
Related Party Transaction [Line Items] |  |
Revenues | $ 3,496 | $ 3,604

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