Combined Guarantor Subsidiaries - Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Rental revenues	$ 190,980	$ 212,729
Revenues from contracts with customers (ASC 606):	5,540	6,359
Total revenues	198,030	220,200
Malls
Disaggregation of Revenue [Line Items]
Total revenues	183,864	200,715
Operating expense reimbursements
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):	2,143	2,343
Operating expense reimbursements \| Malls
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):	2,192	2,190
Marketing revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):	874	1,295
Marketing revenues \| Malls
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):	876	1,294
Other revenues
Disaggregation of Revenue [Line Items]
Other revenues	1,510	1,112
Guarantor Subsidiaries
Disaggregation of Revenue [Line Items]
Rental revenues	71,272	78,706
Revenues from contracts with customers (ASC 606):	1,588	1,676
Total revenues	72,992	80,438
Guarantor Subsidiaries \| Malls
Disaggregation of Revenue [Line Items]
Total revenues	70,400	77,661
Guarantor Subsidiaries \| Operating expense reimbursements
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):	1,151	1,168
Guarantor Subsidiaries \| Operating expense reimbursements \| Malls
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):	1,151	1,168
Guarantor Subsidiaries \| Marketing revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):	437	508
Guarantor Subsidiaries \| Marketing revenues \| Malls
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606):	437	508
Guarantor Subsidiaries \| Other revenues
Disaggregation of Revenue [Line Items]
Other revenues	$ 132	$ 56

Operating Leases, Income Statement, Other

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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