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v3.20.1

Leases (Tables) | 3 Months Ended
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Mar. 31, 2020
Leases |
Summary of income relating to lease payments and undiscounted cash flows | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Income relating to lease payments: | ​ | ​
​ | ​ | Three Months Ended
(in thousands) |  | March 31, 2020 |  | March 31, 2019
Income from leases (1) | ​ | $ | 61,529 | ​ | $ | 62,107
​ | ​ | $ | 61,529 | ​ | $ | 62,107
​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Amount from variable lease payments $15,629 and $16,065 for the three months ended March 31, 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_
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Balance Type: | na
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