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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Related Party Transaction [Line Items] |  |  |  |
Rental revenue | $ 9,628 | $ 11,454 | $ 30,183 | $ 34,461
Property operating expenses | 5,610 | 6,388 | 16,500 | 18,507
General and administrative | 3,698 | 1,997 | 12,799 | 7,958
Advisory fee to related party | 3,419 | 2,329 | 11,594 | 7,055
Interest income | 6,128 | 5,421 | 17,388 | 16,459
Interest expense | 7,057 | 7,622 | 22,476 | 26,295
Affiliate |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Rental revenue | 312 | 262 | 867 | 808
Property operating expenses | 178 | 254 | 755 | 750
General and administrative | 1,017 | 1,094 | 3,434 | 2,991
Interest income | 5,053 | 4,812 | 15,139 | 14,613
Interest expense | 1,431 | 1,583 | 4,199 | 5,040
Affiliate | Pillar and Regis |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Rental revenue | 312 | 262 | 867 | 808
Affiliate | Regis |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Property operating expenses | 178 | 254 | 755 | 750
Affiliate | Pillar |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
General and administrative | 1,017 | 1,094 | 3,434 | 2,991
Advisory fee to related party | 3,419 | 2,329 | 11,594 | 7,055
Interest expense | 1,431 | 1,583 | 4,199 | 5,040
Affiliate | UHF and Pillar |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest income | $ 5,053 | $ 4,812 | $ 15,139 | $ 14,613
ARL | Affiliate | MRHI |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership interest | 90.80% |  | 90.80% |

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- Definition Amount of expense incurred and directly related to generating revenue by lessor from operating lease of rented property and equipment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)(c)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123420820&loc=SL77919311-209978 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=124502072&loc=SL77927221-108306 + Details
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