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Noncontrolling Interest Of Common Units In SLP (Noncontrolling Interest Reconciliation Of Common Units) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Noncontrolling interest in consolidated partnership, redemption value $1,139 and $25 $ 371us-gaap_MinorityInterestInOperatingPartnerships $ 90us-gaap_MinorityInterestInOperatingPartnerships
Common Units [Member]    
Common Operating Partnership Units Outstanding 4sppr_CommonOperatingPartnershipUnitsOutstanding
/ us-gaap_StatementClassOfStockAxis
= sppr_CommonUnitsMember		  
Long Term Incentive Plan Units [Member]    
Common Operating Partnership Units Outstanding 277sppr_CommonOperatingPartnershipUnitsOutstanding
/ us-gaap_StatementClassOfStockAxis
= sppr_LongTermIncentivePlanUnitsMember