Investments in Unconsolidated Real Estate Joint Ventures (Joint Venture Fees) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Management, Leasing and other services [Line Items]
Fees received	$ 1,359	$ 725	$ 2,731	$ 2,168
Management and Marketing Fee [Member]
Management, Leasing and other services [Line Items]
Fees received	537	144	1,045	685
Leasing and other fees [Member]
Management, Leasing and other services [Line Items]
Fees received	103	15	159	35
Expense reimbursements from unconsolidated joint ventures [Member]
Management, Leasing and other services [Line Items]
Fees received	$ 719	$ 566	$ 1,527	$ 1,448