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Variable Interest Entities, Contingent Liability and Consolidated Joint Ventures - Ground Leases (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Variable Interest Entities |  |  |  |
Rental income, net | $ 20,861,000 | $ 20,719,000 | $ 42,100,000 | $ 41,874,000
Variable Interest Entity, Not Primary Beneficiary | Ground lease rental income |  |  |  |
Variable Interest Entities |  |  |  |
Rental income, net | 243,000 | 486,000 | 486,000 | 971,000
Variable Interest Entity, Not Primary Beneficiary | Property located in, Wheaton, Illinois | Ground lease rental income |  |  |  |
Variable Interest Entities |  |  |  |
Rental income, net |  | $ 306,000 |  | $ 611,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio |  |  |  |
VIE ground leases and aggregate carrying amount and maximum exposure to loss |  |  |  |
Owner/ Operator Mortgage from Third Party |  |  | 67,444,000 |
Carrying Amount and Maximum Exposure to Loss | $ 13,901,000 |  | $ 13,901,000 |

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