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Related Party Transactions and Investments in Non-Consolidated Entities (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 entity	Mar. 31, 2014 entity	Dec. 31, 2014 entity
Related Party Transactions and Investments in Non-Consolidated Entities
Sponsored REITs (in entities)	9fsp_NumberOfSponsoredREITs	14fsp_NumberOfSponsoredREITs	10fsp_NumberOfSponsoredREITs
Balance Sheet Data (unaudited):
Real estate, net	$ 421,849fsp_EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet		$ 451,822fsp_EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet
Other assets	105,791fsp_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets		127,259fsp_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets
Total liabilities	(200,754)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities		(203,239)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
Shareholders' equity	326,886us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity		375,842us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
Operating Data (unaudited):
Rental revenues	13,900fsp_EquityMethodInvestmentSummarizedFinancialInformationRentalRevenue	23,305fsp_EquityMethodInvestmentSummarizedFinancialInformationRentalRevenue
Other revenues	2fsp_EquityMethodInvestmentSummarizedFinancialInformationOtherRevenue	14fsp_EquityMethodInvestmentSummarizedFinancialInformationOtherRevenue
Operating and maintenance expenses	(8,235)fsp_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndMaintenanceExpense	(11,746)fsp_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndMaintenanceExpense
Depreciation and amortization	(4,975)fsp_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization	(7,677)fsp_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization
Interest expense	(2,457)fsp_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	(3,431)fsp_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense
Net income	$ (1,765)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	$ 465us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss

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