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REVENUES - Disaggregation of Revenue (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues |  |  |  |  |  |  |  |  |  | $ 736,878,000 |  | $ 829,113,000 |  | $ 909,595,000 |
Revenues from contracts with customers (ASC 606): |  |  |  |  |  |  |  |  |  | 25,192,000 |  | 25,262,000 |  |  |
Total revenues |  | $ 190,038,000 | $ 187,251,000 | $ 193,377,000 | $ 198,030,000 | $ 216,881,000 | $ 206,878,000 | $ 214,598,000 | $ 220,200,000 | 768,696,000 | [1] | 858,557,000 | [1] | 927,252,000 | [1]
Malls |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | [1] |  |  |  |  |  |  |  |  | 699,698,000 |  | 783,194,000 |  | $ 847,979,000 |
Operating expense reimbursements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers (ASC 606): |  |  |  |  |  |  |  |  |  | 9,783,000 |  | 8,434,000 |  |  |
Operating expense reimbursements | Malls |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers (ASC 606): |  |  |  |  |  |  |  |  |  | 9,404,000 |  | 5,873,000 |  |  |
Operating expense reimbursements | All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers (ASC 606): |  |  |  |  |  |  |  |  |  | 379,000 |  | 2,561,000 |  |  |
Management, development and leasing fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers (ASC 606): |  |  |  |  |  |  |  |  |  | 9,350,000 |  | 10,542,000 |  |  |
Marketing revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers (ASC 606): |  |  |  |  |  |  |  |  |  | 6,059,000 |  | 6,286,000 |  |  |
Marketing revenues | Malls |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers (ASC 606): |  |  |  |  |  |  |  |  |  |  |  | 6,255,000 |  |  |
Marketing revenues | All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers (ASC 606): |  |  |  |  |  |  |  |  |  |  |  | 31,000 |  |  |
Other revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | $ 6,626,000 |  | $ 4,182,000 |  |  |
[1] | Management, development and leasing fees are included in All Other category. See Note 3 for information on the Company’s revenues disaggregated by revenue source for each of the above segments.

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