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Series A Preferred Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 30, 2005
Feb. 15, 2012
Jan. 31, 2012
Series A Preferred Stock [Line Items]            
Common operating partnership units outstanding 97,008sppr_CommonOperatingPartnershipUnitsOutstanding          
Preferred stock, shares issued     3,000,000us-gaap_PreferredStockSharesIssued   3,000,000us-gaap_PreferredStockSharesIssued 3,000,000us-gaap_PreferredStockSharesIssued
Common stock warrants, exercise price 9.60us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights          
Proceeds from common stock issued in rights offering $ 860us-gaap_ProceedsFromIssuanceOfCommonStock $ 0us-gaap_ProceedsFromIssuanceOfCommonStock $ 0us-gaap_ProceedsFromIssuanceOfCommonStock      
Preferred A Stock [Member]            
Series A Preferred Stock [Line Items]            
Preferred stock, redemption price $ 10.00us-gaap_PreferredStockRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Preferred stock, shares issued       1,521,258us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Annual dividend rate 8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
  8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Preferred stock, shares outstanding 803,270us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
803,270us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Preferred stock, liquidation preference per share       $ 10.00us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Preferred stock, fixed annual amount of dividend per share $ 0.80us-gaap_PreferredStockDividendRatePerDollarAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Dividends unpaid and accrued $ 725us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Dividends unpaid and accrued per share $ 0.902us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember