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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Oct. 29, 2021 | Oct. 28, 2021
Sponsored REITs |  |  |  |
Amount Drawn |  |  | $ 24,000,000 | $ 21,000,000
Related party mortgage loan receivable |  |  | 24,000,000 | $ 21,000,000
Sponsored REITs |  |  |  |
Sponsored REITs |  |  |  |
Interest income and fees from the Sponsored REIT Loans | $ 0 | $ 451,000 |  |
FSP Monument Circle LLC |  |  |  |
Sponsored REITs |  |  |  |
Additional loan amount |  |  | $ 3,000,000.0 |

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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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