Component of Rental Income and Expense Components of Rental Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Rental Income [Line Items]
Cost reimbursement	$ 0	$ 0	$ 34,584
Percentage rent	3,516	2,476	3,149
Hotel revenue	17,209	40,297	40,049
Other	2,185	2,223	1,611
Total rental income	330,312	343,865	309,537
Total Retail
Rental Income [Line Items]
Minimum rents	82,176	99,601	77,147
Total Office
Rental Income [Line Items]
Minimum rents	170,853	136,118	95,081
Total Multifamily
Rental Income [Line Items]
Minimum rents	47,071	47,448	46,897
Total Mixed-Use
Rental Income [Line Items]
Minimum rents	$ 7,302	$ 15,702	$ 11,019