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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Related Party Transaction [Line Items] |  |
Rental revenues | $ 10,361 | $ 11,442
Property operating expenses | 5,832 | 6,309
General and administrative | 3,235 | 4,292
Advisory fee to related party | 2,436 | 2,373
Interest income | 5,644 | 5,754
Interest expense | 7,738 | 9,602
Affiliate |  |
Related Party Transaction [Line Items] |  |
Rental revenues | 242 | 221
Property operating expenses | 382 | 242
General and administrative | 1,670 | 1,133
Interest income | 4,769 | 5,073
Interest expense | 1,395 | 1,915
Affiliate | Pillar and Regis |  |
Related Party Transaction [Line Items] |  |
Rental revenues | 242 | 221
Affiliate | Regis |  |
Related Party Transaction [Line Items] |  |
Property operating expenses | 382 | 242
Affiliate | Pillar |  |
Related Party Transaction [Line Items] |  |
General and administrative | 1,670 | 1,133
Advisory fee to related party | 2,436 | 2,373
Interest expense | 1,395 | 1,915
Affiliate | UHF and Pillar |  |
Related Party Transaction [Line Items] |  |
Interest income | $ 4,769 | $ 5,073
Affiliate | ARL | MRHI |  |
Related Party Transaction [Line Items] |  |
Ownership interest | 90.80% |

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