Investments in Unconsolidated Real Estate Joint Ventures (Joint Venture Fees) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Management, Leasing and other services [Line Items]
Fees received	$ 1,641	$ 1,194	$ 4,372	$ 3,362
Management and Marketing Fee [Member]
Management, Leasing and other services [Line Items]
Fees received	530	471	1,575	1,156
Leasing and other fees [Member]
Management, Leasing and other services [Line Items]
Fees received	72	15	231	50
Expense reimbursements from unconsolidated joint ventures [Member]
Management, Leasing and other services [Line Items]
Fees received	$ 1,039	$ 708	$ 2,566	$ 2,156