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EQUITY-BASED COMPENSATION (Details 4) (Restricted Stock Awards, Performance-Based, USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended
May 28, 2014
Mar. 02, 2013
Apr. 25, 2012
Dec. 31, 2014
item
Dec. 31, 2013
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Jun. 19, 2014
Performance-based restricted stock awards            
Vesting period 3 years 3 years 3 years      
Assumptions used to compute the fair value of options granted was estimated using the Black-Scholes valuation model            
Expected dividend yield (as a percent)       4.48%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate 4.52%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate  
Expected stock price volatility (as a percent)       27.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate 38.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate  
Risk-free interest rate, minimum (as a percent)       0.06%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum 0.147%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum  
Risk-free interest rate, maximum (as a percent)       0.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum 0.513%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum  
Monte Carlo iterations       100,000inn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMonteCarloIterations 100,000inn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMonteCarloIterations  
Weighted average estimated fair value of options at grant date per share (in dollars per share)       $ 7.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 7.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Number of Shares            
Non-vested at the beginning of period (in shares)       268,174us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 82,602us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber  
Granted (in shares) 161,935us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 185,572us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 82,602us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 161,935us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 185,572us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod  
Vested (in shares)       (45,551)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod    
Non-vested at the end of period (in shares)       384,558us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 268,174us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber  
Weighted Average Grant Date Fair Value            
Non-vested at the beginning of period (in dollars per share)       $ 6.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 7.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue  
Granted (in dollars per share)       $ 7.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 7.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Vested (in dollars per share)       $ 6.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue    
Non-vested at the end of period (in dollars per share)       $ 6.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 6.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue  
Aggregate Current Value            
Non-vested at the end of period       $ 4,784inn_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateCurrentValueNonvested    
Performance Period, one
           
Performance-based restricted stock awards            
Designated performance period to measure performance based on which share based awards vests       1 year    
Performance Period, two
           
Performance-based restricted stock awards            
Designated performance period to measure performance based on which share based awards vests       2 years    
Performance Period, three
           
Performance-based restricted stock awards            
Designated performance period to measure performance based on which share based awards vests       3 years    
Mr. Becker | Severance and release agreement            
Number of Shares            
Vested (in shares)           45,551us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= inn_StuartJBeckerMember
/ us-gaap_TypeOfArrangementAxis
= inn_SeveranceAndReleaseAgreementMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnPerformanceMember