REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Rental revenues		$ 554,064	$ 736,878	$ 829,113
Revenues from contracts with customers (ASC 606):		18,541	25,192	25,262
Total revenues	[1]	575,861	768,696	858,557
Malls
Disaggregation Of Revenue [Line Items]
Total revenues	[1]	520,643	699,698	783,194
Operating expense reimbursements
Disaggregation Of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):		9,025	9,783	8,434
Operating expense reimbursements | Malls
Disaggregation Of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):		8,638	9,404	5,873
Operating expense reimbursements | All Other Segments
Disaggregation Of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):		387	379	2,561
Management, development and leasing fees
Disaggregation Of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):		6,800	9,350	10,542
Marketing Revenues
Disaggregation Of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):		2,716	6,059	6,286
Other revenues
Disaggregation Of Revenue [Line Items]
Total revenues		$ 3,256	$ 6,626	$ 4,182

[1] Management, development and leasing fees are included in All Other category. See Note 4 for information on the Company’s revenues disaggregated by revenue source for each of the above segments.