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Combined Guarantor Subsidiaries - Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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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

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