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Long-Term Debt (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
property
Dec. 31, 2012
property
Jun. 07, 2011
Debt Instrument [Line Items]        
Maximum dividends percentage over funds from operations 75.00%sppr_MaximumDividendsPercentageOverFundsFromOperations      
Face amount of note       $ 3,100,000us-gaap_DebtInstrumentFaceAmount
Encumbered properties   56sppr_EncumberedProperties 68sppr_EncumberedProperties  
Credit facility, amount outstanding 7,900,000us-gaap_LineOfCreditFacilityAmountOutstanding      
Percentage Of Appraisal Value 70.00%sppr_PercentageOfAppraisalValue      
Long-term Debt 92,687,000us-gaap_LongTermDebt 118,045,000us-gaap_LongTermDebt    
Long term debt, weighted average term to maturity   2 years    
Long-term debt, weighted average interest rate   6.50%us-gaap_LongtermDebtWeightedAverageInterestRate    
Principal due in 2015 46,872,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths      
Principal Due Pursuant To Notes And Mortgages Evidencing Debt 42,100,000sppr_PrincipalDuePursuantToNotesAndMortgagesEvidencingDebt      
Principal Due Associated With Loans On Assets Held For Sale 4,800,000sppr_PrincipalDueAssociatedWithLoansOnAssetsHeldForSale      
Repayments of debt 300,000us-gaap_RepaymentsOfDebt      
Cross Collateralized Assets Securing Loan 15sppr_CrossCollateralizedAssetsSecuringLoan      
Cross Collateralized Assets Held For Sale 8sppr_CrossCollateralizedAssetsHeldForSale      
Principal Payment Required at Sale 14,200,000sppr_PrincipalPaymentRequiredAtSale      
Held For Use [Member]        
Debt Instrument [Line Items]        
Long-term Debt 74,277,000us-gaap_LongTermDebt
/ sppr_DebtAssociatedAssetsCategoryAxis
= sppr_AssetsHeldForUseMember		      
Principal due in 2015 28,462,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ sppr_DebtAssociatedAssetsCategoryAxis
= sppr_AssetsHeldForUseMember		      
GE Capital Franchise Finance LLC [Member]        
Debt Instrument [Line Items]        
Required before dividend consolidated fixed charge coverage ratio 1.00sppr_BeforeDividendConsolidatedFixedChargeCoverageRatioCovenant
/ us-gaap_DebtInstrumentAxis
= sppr_GeCapitalFranchiseFinanceLlcMember		      
Required after dividend consolidated fixed charge coverage ratio 1.00sppr_AfterDividendConsolidatedFixedChargeCoverageRatioCovenant
/ us-gaap_DebtInstrumentAxis
= sppr_GeCapitalFranchiseFinanceLlcMember		      
Principal due in 2015 10,700,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_DebtInstrumentAxis
= sppr_GeCapitalFranchiseFinanceLlcMember		      
Great Western Bank [Member]        
Debt Instrument [Line Items]        
Credit facility maximum borrowing capacity 12,500,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= sppr_GreatWesternBankMember		      
Required loan-specific debt service coverage ratio 1.20sppr_LoanSpecificDebtServiceCoverageRatioCovenant
/ us-gaap_DebtInstrumentAxis
= sppr_GreatWesternBankMember		      
Long-term Debt 92,687,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sppr_GreatWesternBankMember		      
Principal due in 2015 1,400,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_DebtInstrumentAxis
= sppr_GreatWesternBankMember		      
Great Western Bank [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Principal due in 2015 7,900,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= sppr_GreatWesternBankMember		      
Great Western Bank [Member] | Term Loan One [Member]        
Debt Instrument [Line Items]        
Principal due in 2015 1,400,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_CreditFacilityAxis
= sppr_TermLoanOneMember
/ us-gaap_DebtInstrumentAxis
= sppr_GreatWesternBankMember		      
Citigroup Global Markets Realty Corp [Member]        
Debt Instrument [Line Items]        
Principal due in 2015 11,900,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_DebtInstrumentAxis
= sppr_CitigroupGlobalMarketsRealtyCorpMember		      
Middle Patent Capital, LLC [Member]        
Debt Instrument [Line Items]        
Principal due in 2015 8,300,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_DebtInstrumentAxis
= sppr_MiddlePatentCapitalLlcMember		      
Amortization Of Mortgage Loans [Member]        
Debt Instrument [Line Items]        
Principal due in 2015 $ 1,900,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_DebtInstrumentAxis
= sppr_AmortizationOfMortgageLoansMember		      
Minimum [Member] | GE Capital Franchise Finance LLC [Member]        
Debt Instrument [Line Items]        
Required loan specific loan to value ratio 0.595sppr_LoanSpecificLoanToValueRatioCovenant
/ us-gaap_DebtInstrumentAxis
= sppr_GeCapitalFranchiseFinanceLlcMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Maximum [Member] | GE Capital Franchise Finance LLC [Member]        
Debt Instrument [Line Items]        
Required loan specific loan to value ratio 0.60sppr_LoanSpecificLoanToValueRatioCovenant
/ us-gaap_DebtInstrumentAxis
= sppr_GeCapitalFranchiseFinanceLlcMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember