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DERIVITIVE FINANCIAL INSTRUMENTS AND HEDGING (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Oct. 31, 2013
Sep. 05, 2013
Dec. 31, 2013
Oct. 10, 2013
Jan. 02, 2014
Dec. 27, 2013
Oct. 30, 2013
Derivative financial instruments and hedging                
Maximum length of time over which instruments are hedged 6 years              
Fair Value                
Assets $ 66,000us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement     $ 253,000us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement        
Liability (1,957,000)us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement     (1,772,000)us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement        
Senior Unsecured Credit Facility                
Derivative financial instruments and hedging                
Maximum borrowing capacity         300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member
     
Senior Unsecured Credit Facility | $75 Million Term Loan                
Derivative financial instruments and hedging                
Maximum borrowing capacity 75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= inn_TermLoanDue10October2018Member
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member
      75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= inn_TermLoanDue10October2018Member
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member
75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= inn_TermLoanDue10October2018Member
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member
75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= inn_TermLoanDue10October2018Member
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member
 
Effective interest Rate (as a percent) 3.94%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_CreditFacilityAxis
= inn_TermLoanDue10October2018Member
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member
        3.94%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_CreditFacilityAxis
= inn_TermLoanDue10October2018Member
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member
   
Interest rate derivative financial instruments                
Fair Value                
Aggregate derivative contract termination value 2,100,000us-gaap_AssetsNeededForImmediateSettlementAggregateFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
             
Interest rate derivative financial instruments | Term mortgage loan                
Notional Amount                
Total               10,300,000invest_DerivativeNotionalAmount
/ us-gaap_DebtInstrumentAxis
= inn_MortgageLoanWithGeneralElectricCapitalCorporationDue1April2014Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Interest rate derivative financial instruments | Term mortgage loan | Maximum                
Derivative financial instruments and hedging                
Termination costs   100,000us-gaap_GainLossOnContractTermination
/ us-gaap_DebtInstrumentAxis
= inn_MortgageLoanWithGeneralElectricCapitalCorporationDue1April2014Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
Interest rate derivative financial instruments | Senior Unsecured Credit Facility | $75 Million Term Loan | LIBOR                
Derivative financial instruments and hedging                
Variable rate basis     LIBOR          
Fixed rate with derivative (as a percent)     2.04%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CreditFacilityAxis
= inn_TermLoanDue10October2018Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
         
Designated as a hedge                
Number of Instruments                
Total 4us-gaap_DerivativeNumberOfInstrumentsHeld
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
    4us-gaap_DerivativeNumberOfInstrumentsHeld
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
       
Notional Amount                
Total 103,002,000invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
    104,273,000invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
       
Fair Value                
Net liability (1,891,000)us-gaap_DerivativeLiabilities
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
    (1,519,000)us-gaap_DerivativeLiabilities
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
       
Designated as a hedge | Interest rate derivative financial instruments                
Number of Instruments                
Asset 3us-gaap_DerivativeAssetNumberOfInstrumentsHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
    3us-gaap_DerivativeAssetNumberOfInstrumentsHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
       
Liability 1us-gaap_DerivativeLiabilityNumberOfInstrumentsHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
    1us-gaap_DerivativeLiabilityNumberOfInstrumentsHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
       
Notional Amount                
Assets 28,002,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
    29,273,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
       
Liability 75,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
    75,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
       
Fair Value                
Assets 66,000us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
    253,000us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
       
Liability (1,957,000)us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
    (1,772,000)us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
       
Designated as a hedge | Interest rate derivative financial instruments | Senior Unsecured Credit Facility | $75 Million Term Loan                
Notional Amount                
Total     75,000,000invest_DerivativeNotionalAmount
/ us-gaap_CreditFacilityAxis
= inn_TermLoanDue10October2018Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member