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Leases (Tables) | 6 Months Ended
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Jun. 30, 2020
Leases |
Summary of income relating to lease payments and undiscounted cash flows | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Income relating to lease payments: | ​ | ​
​ | ​ | Six Months Ended
(in thousands) |  | June 30, 2020 |  | June 30, 2019
Income from leases (1) | ​ | $ | 121,474 | ​ | $ | 123,821
​ | ​ | $ | 121,474 | ​ | $ | 123,821
​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Amount from variable lease payments $29,945 and $32,085 for the six months ended June 30, 2020 and 2019, 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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