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Investments in Unconsolidated Joint Ventures - Combined Condensed Statements of Operations of Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues: |  |  |  |  |  |  |  |  |  |  |
Leasing revenue |  |  |  |  |  |  |  |  | $ 740,323 | $ 858,874 | $ 883,996
Total revenues | $ 194,643 | $ 185,844 | $ 178,587 | $ 226,952 | $ 241,841 | $ 231,127 | $ 227,972 | $ 226,522 | 786,026 | 927,462 | 960,351
Expenses: |  |  |  |  |  |  |  |  |  |  |
Leasing expense |  |  |  |  |  |  |  |  | 25,191 | 29,611 |
Interest expense |  |  |  |  |  |  |  |  | 75,550 | 138,254 | 182,962
Depreciation and amortization |  |  |  |  |  |  |  |  | 319,619 | 330,726 | 327,436
Total expenses |  |  |  |  |  |  |  |  | 773,487 | 859,918 | 934,931
Loss on sale or write down of assets, net |  |  |  |  |  |  |  |  | (68,112) | (11,909) | (31,825)
Net (loss) income |  |  |  |  |  |  |  |  | (245,462) | 102,554 | 68,972
Company's equity in net loss |  |  |  |  |  |  |  |  | (27,038) | 48,508 | 71,773
Other |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 22,242 | 27,879 | 32,875
Shopping center and operating expenses |  |  |  |  |  |  |  |  |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 257,212 | 271,547 | 277,470
Joint venture |  |  |  |  |  |  |  |  |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |
Company's equity in net loss |  |  |  |  |  |  |  |  | (27,038) | 48,508 | 71,773
Joint venture | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |
Loss on sale or write down of assets, net |  |  |  |  |  |  |  |  | (120) | (452) | (140)
Company's equity in net loss |  |  |  |  |  |  |  |  | (10,371) | (590) | (16)
Joint venture | Other Joint Ventures |  |  |  |  |  |  |  |  |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |
Loss on sale or write down of assets, net |  |  |  |  |  |  |  |  | 157 | (380) | 14,471
Company's equity in net loss |  |  |  |  |  |  |  |  | (16,667) | 49,098 | 71,789
Joint venture | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Leasing revenue |  |  |  |  |  |  |  |  | 171,505 | 187,789 | 186,924
Total revenues |  |  |  |  |  |  |  |  | 172,119 | 189,387 | 187,829
Expenses: |  |  |  |  |  |  |  |  |  |  |
Leasing expense |  |  |  |  |  |  |  |  | 1,325 | 1,598 |
Interest expense |  |  |  |  |  |  |  |  | 64,460 | 67,354 | 67,117
Depreciation and amortization |  |  |  |  |  |  |  |  | 102,788 | 100,490 | 97,885
Total expenses |  |  |  |  |  |  |  |  | 205,591 | 206,970 | 204,285
Net (loss) income |  |  |  |  |  |  |  |  | (33,592) | (18,035) | (16,596)
Joint venture | PPR Portfolio | Other |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 614 | 1,598 | 905
Joint venture | PPR Portfolio | Shopping center and operating expenses |  |  |  |  |  |  |  |  |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 37,018 | 37,528 | 39,283
Joint venture | Other Joint Ventures |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Leasing revenue |  |  |  |  |  |  |  |  | 633,357 | 712,860 | 727,328
Total revenues |  |  |  |  |  |  |  |  | 651,796 | 762,044 | 768,748
Expenses: |  |  |  |  |  |  |  |  |  |  |
Leasing expense |  |  |  |  |  |  |  |  | 4,173 | 6,695 |
Interest expense |  |  |  |  |  |  |  |  | 151,857 | 150,111 | 145,915
Depreciation and amortization |  |  |  |  |  |  |  |  | 285,948 | 273,565 | 248,778
Total expenses |  |  |  |  |  |  |  |  | 682,117 | 680,969 | 641,345
Net (loss) income |  |  |  |  |  |  |  |  | (30,164) | 80,695 | 141,874
Joint venture | Other Joint Ventures | Other |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 18,439 | 49,184 | 41,420
Joint venture | Other Joint Ventures | Shopping center and operating expenses |  |  |  |  |  |  |  |  |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 240,139 | 250,598 | 246,652
Joint venture | Total |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Leasing revenue |  |  |  |  |  |  |  |  | 804,862 | 900,649 | 914,252
Total revenues |  |  |  |  |  |  |  |  | 823,915 | 951,431 | 956,577
Expenses: |  |  |  |  |  |  |  |  |  |  |
Leasing expense |  |  |  |  |  |  |  |  | 5,498 | 8,293 |
Interest expense |  |  |  |  |  |  |  |  | 216,317 | 217,465 | 213,032
Depreciation and amortization |  |  |  |  |  |  |  |  | 388,736 | 374,055 | 346,663
Total expenses |  |  |  |  |  |  |  |  | 887,708 | 887,939 | 845,630
Loss on sale or write down of assets, net |  |  |  |  |  |  |  |  | 37 | (832) | 14,331
Net (loss) income |  |  |  |  |  |  |  |  | (63,756) | 62,660 | 125,278
Joint venture | Total | Other |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 19,053 | 50,782 | 42,325
Joint venture | Total | Shopping center and operating expenses |  |  |  |  |  |  |  |  |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | $ 277,157 | $ 288,126 | 285,935
Affiliated entity | Northwestern Mutual Life (NML) |  |  |  |  |  |  |  |  |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | $ 20,197

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