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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards - Variable Interest Entities (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Variable interest entity |  |  |  |  |
Cash, cash equivalents and restricted cash (amounts related to variable interest entities ("VIEs") |  | $ 31,559 | $ 42,683 | $ 37,779 | $ 127,880
Variable interest entities ("VIEs") |  |  |  |  |
Variable interest entity |  |  |  |  |
Gain on consolidation of Sponsored REIT | $ 400 |  |  |  |
Cash, cash equivalents and restricted cash (amounts related to variable interest entities ("VIEs") |  | $ 1,218 | $ 1,314 |  |
Variable interest entities ("VIEs") | FSP Monument Circle LLC |  |  |  |  |
Variable interest entity |  |  |  |  |
Cash, cash equivalents and restricted cash (amounts related to variable interest entities ("VIEs") | $ 3,000 |  |  |  |

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-24 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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