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