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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Jan. 14, 2022	Jan. 12, 2022	Feb. 10, 2022	Jan. 10, 2022	Dec. 31, 2021
Subsequent Events
Total available					$ 600.0
Subsequent event
Subsequent Events
Special dividend (in dollars per share)		$ 0.32
BofA Revolver
Subsequent Events
Total available					$ 600.0
BofA Revolver | Subsequent event
Subsequent Events
Total available			$ 237.5	$ 217.5
Maximum borrowing capacity allowed by exercising an accordion feature				$ 750.0
Increase in maximum borrowing capacity after exercising accordion feature			$ 20.0
Cash distribution declared | Subsequent event
Subsequent Events
Cash dividend declared per share (in dollars per share)	$ 0.09

X

- Definition

Aggregate special dividends declared during the period for each share of common stock outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsp_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase in the maximum borrowing capacity under the credit facility upon exercise of the accordion feature.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The maximum borrowing capacity under the credit facility upon exercise of the accordion feature which is subject to receipt of lender commitments and satisfaction of certain customary conditions.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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