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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Consolidated Balance Sheets |  |
Acquired real estate leases, accumulated amortization | $ 101,838 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | $ 69,848 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Tenant rent receivables, allowance for doubtful accounts | 325 us-gaap_AllowanceForDoubtfulAccountsReceivable | 50 us-gaap_AllowanceForDoubtfulAccountsReceivable
Straight-line rent receivable, allowance for doubtful accounts | 162 fsp_AllowanceForDoubtfulDeferredRentReceivables | 135 fsp_AllowanceForDoubtfulDeferredRentReceivables
Office computers and furniture, accumulated depreciation | 1,036 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | 747 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Deferred leasing commissions, accumulated amortization | 16,944 us-gaap_DeferredCostsLeasingAccumulatedAmortization | 15,031 us-gaap_DeferredCostsLeasingAccumulatedAmortization
Acquired unfavorable real estate leases, accumulated amortization | $ 8,687 fsp_UnfavorableRealEstateLeasesAccumulatedAmortization | $ 6,926 fsp_UnfavorableRealEstateLeasesAccumulatedAmortization
Preferred stock, par value (in dollars per share) | $ 0.0001 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.0001 us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized (in shares) | 20,000,000 us-gaap_PreferredStockSharesAuthorized | 20,000,000 us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (in shares) | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding (in shares) | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) | $ 0.0001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.0001 us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) | 180,000,000 us-gaap_CommonStockSharesAuthorized | 180,000,000 us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) | 100,187,405 us-gaap_CommonStockSharesIssued | 100,187,405 us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares) | 100,187,405 us-gaap_CommonStockSharesOutstanding | 100,187,405 us-gaap_CommonStockSharesOutstanding

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- Definition The valuation allowance as of the balance sheet date to reduce the gross amount of deferred rent receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet. + References No definition available. + Details
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- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453741&loc=d3e40879-112712 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40588-112709 + Details
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