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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Management fees
Related Party Transaction [Line Items]
Revenues	$ 6,004	$ 9,978	$ 19,807	$ 29,277
Unconsolidated Joint Ventures and Third Party Managed Properties
Related Party Transaction [Line Items]
Revenues	5,728	9,034	18,904	24,991
Unconsolidated Joint Ventures and Third Party Managed Properties | Management fees
Related Party Transaction [Line Items]
Revenues	4,285	4,746	13,066	13,897
Unconsolidated Joint Ventures and Third Party Managed Properties | Development and leasing fees
Related Party Transaction [Line Items]
Revenues	$ 1,443	$ 4,288	$ 5,838	$ 11,094

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