Related Party Transactions - Schedule of fees charged to unconsolidated joint ventures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Management fees
Related Party Transaction [Line Items]
Revenues	$ 6,830	$ 9,119	$ 13,803	$ 19,299
Unconsolidated Joint Ventures and Third Party Managed Properties
Related Party Transaction [Line Items]
Revenues	6,606	7,980	13,176	15,957
Unconsolidated Joint Ventures and Third Party Managed Properties | Management fees
Related Party Transaction [Line Items]
Revenues	4,295	4,670	8,781	9,151
Unconsolidated Joint Ventures and Third Party Managed Properties | Development and leasing fees
Related Party Transaction [Line Items]
Revenues	$ 2,311	$ 3,310	$ 4,395	$ 6,806