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Significant Accounting Policies (Details 6) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012
Deferred Leasing Commissions |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred leasing commissions |  |  |  |  |  |  |  |  | $ 5,786,000 us-gaap_AmortizationOfDeferredLeasingFees | $ 4,683,000 us-gaap_AmortizationOfDeferredLeasingFees | $ 4,173,000 us-gaap_AmortizationOfDeferredLeasingFees
Estimated annual amortization of deferred leasing commissions for the succeeding five years |  |  |  |  |  |  |  |  |  |  |
2015 |  |  |  |  |  |  |  |  | 5,401,000 fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearOne |  |
2016 |  |  |  |  |  |  |  |  | 4,959,000 fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearTwo |  |
2017 |  |  |  |  |  |  |  |  | 4,044,000 fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearThree |  |
2018 |  |  |  |  |  |  |  |  | 3,603,000 fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearFour |  |
2019 |  |  |  |  |  |  |  |  | 2,959,000 fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearFive |  |
2020 and thereafter |  |  |  |  |  |  |  |  | 6,215,000 fsp_DeferredLeasingCommissionsFutureAmortizationExpenseAfterYearFive |  |
Summary of rental revenue |  |  |  |  |  |  |  |  |  |  |
Income from leases |  |  |  |  |  |  |  |  | 189,508,000 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue | 159,472,000 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue | 116,494,000 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Reimbursable expenses |  |  |  |  |  |  |  |  | 49,731,000 us-gaap_TenantReimbursements | 41,486,000 us-gaap_TenantReimbursements | 29,847,000 us-gaap_TenantReimbursements
Straight-line rent adjustment |  |  |  |  |  |  |  |  | 4,737,000 fsp_DeferredRentReceivableAdjustment | 5,755,000 fsp_DeferredRentReceivableAdjustment | 4,366,000 fsp_DeferredRentReceivableAdjustment
Amortization of favorable and unfavorable leases |  |  |  |  |  |  |  |  | (635,000)fsp_AmortizationOfFiniteLivedIdentifiableIntangibleAssetLiabilityNet | 213,000 fsp_AmortizationOfFiniteLivedIdentifiableIntangibleAssetLiabilityNet | (273,000)fsp_AmortizationOfFiniteLivedIdentifiableIntangibleAssetLiabilityNet
Rental revenue |  |  |  |  |  |  |  |  | 243,341,000 us-gaap_RealEstateRevenueNet | 206,926,000 us-gaap_RealEstateRevenueNet | 150,434,000 us-gaap_RealEstateRevenueNet
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Number of reporting segments |  |  |  |  |  |  |  |  | 1 us-gaap_NumberOfReportableSegments |  |
Net Income Per Share |  |  |  |  |  |  |  |  |  |  |
Potential dilutive shares outstanding |  |  |  |  |  |  |  |  | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Denominator used for calculating basic and diluted net income per share (in shares) | 100,187,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 100,187,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 100,187,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 100,187,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 100,187,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 100,187,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 91,847,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 82,937,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 100,187,405 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 93,855,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 82,937,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Derivative instruments |  |  |  |  |  |  |  |  |  |  |
Fair value hedges outstanding | $ 0 us-gaap_FairValueHedgesAtFairValueNet |  |  |  |  |  |  |  | $ 0 us-gaap_FairValueHedgesAtFairValueNet |  |

X
- Definition The net amount of expense (income) recorded in earnings to allocate the value of the identifiable intangible asset or liability established for an assumed above or below-market lease acquired in an acquisition. + References No definition available. + Details
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Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | fsp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of amortization expense expected to be recognized for the remainder of deferred leasing commissions useful life after the fifth succeeding fiscal year. + References No definition available. + Details
Name: | fsp_DeferredLeasingCommissionsFutureAmortizationExpenseAfterYearFive
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of amortization of deferred leasing commissions expected to be recognized during the year five of the five succeeding fiscal years. + References No definition available. + Details
Name: | fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearFive
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of amortization of deferred leasing commissions expected to be recognized during the year four of the five succeeding fiscal years. + References No definition available. + Details
Name: | fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearFour
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of amortization of deferred leasing commissions expected to be recognized during the year one of the five succeeding fiscal years. + References No definition available. + Details
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Namespace Prefix: | fsp_
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Balance Type: | debit
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- Definition The amount of amortization of deferred leasing commissions expected to be recognized during the year three of the five succeeding fiscal years. + References No definition available. + Details
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Namespace Prefix: | fsp_
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of amortization of deferred leasing commissions expected to be recognized during the year two of the five succeeding fiscal years. + References No definition available. + Details
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Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The adjustment during the reporting period in the amount due that is the result of the cumulative difference between actual rent due and rental income recognized on a straight-line basis. + References No definition available. + Details
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Namespace Prefix: | fsp_
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- Details
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- Definition This element represents the amortization of deferred leasing fees incurred by the lessor and amortized over the term of the lease. Such fees represent (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40246-112709 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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- Definition Net fair value of all derivative instruments designated as fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Balance Type: | na
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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The aggregate revenue from real estate operations during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | credit
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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). + References No definition available. + Details
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