XML 52 R42.htm IDEA: XBRL DOCUMENT
v3.23.3

Leases - Income Relating to Lease Payments (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Income relating to lease payments: |  |
Income from leases | $ 111,316 | $ 118,843
Undiscounted Cash Flows |  |
Variable lease payments | $ 32,275 | $ 37,050

X
- Definition Represents lease income from operating lease less straight-line rent adjustment and amortization of favorable and unfavorable leases. + References No definition available. + Details
Name: | fsp_OperatingLeaseLeaseIncomeLessStraightLineRentAdjustmentAndAmortizationOfFavorableAndUnfavorableLeases
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating lease income from variable lease payments paid and payable to lessor, excluding amount included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479773/842-30-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482964/270-10-50-6A + Details
Name: | us-gaap_OperatingLeaseVariableLeaseIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OperatingLeasesLeaseIncomeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration