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Leases (Tables) | 6 Months Ended
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Jun. 30, 2021
Leases |
Summary of income relating to lease payments and undiscounted cash flows | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Income relating to lease payments: | ​ | ​
​ | ​ | Six Months Ended
(in thousands) |  | June 30, 2021 |  | June 30, 2020
Income from leases (1) | ​ | $ | 111,362 | ​ | $ | 121,474
​ | ​ | $ | 111,362 | ​ | $ | 121,474
​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Amounts recognized from variable lease payments were $28,974 and $29,945 for the six months ended June 30, 2021 and 2020, respectively. | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of components of income from operating lease and maturity of undiscounted cash flows to be received by lessor on annual basis for operating lease. + References No definition available. + Details
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Namespace Prefix: | fsp_
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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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