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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Management fees
Related Party Transaction
Other	$ 6,787	$ 6,004	$ 18,986	$ 19,807
Unconsolidated Joint Ventures and Third Party Managed Properties
Related Party Transaction
Other	6,341	5,728	17,129	18,904
Unconsolidated Joint Ventures and Third Party Managed Properties | Management fees
Related Party Transaction
Other	4,594	4,285	12,397	13,066
Unconsolidated Joint Ventures and Third Party Managed Properties | Development and leasing fees
Related Party Transaction
Other	$ 1,747	$ 1,443	$ 4,732	$ 5,838

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