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Equity (Details) (USD $) | 9 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2014 | Dec. 31, 2013 | Mar. 20, 2013 | May 28, 2014 | Sep. 30, 2014 | Mar. 01, 2013 | Jun. 13, 2013 | Sep. 19, 2013 | Jan. 14, 2013
Equity |  |  |  |  |  |  |  |  |  |
Proceeds from equity offerings, net of offering costs | $ 389,389,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 100,000,000 us-gaap_PreferredStockSharesAuthorized | 100,000,000 us-gaap_PreferredStockSharesAuthorized |  |  | 100,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |  |  | 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  | $ 9.75 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |
Series A preferred shares |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 2,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 2,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  | 2,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Preferred stock, dividend rate (as a percent) |  | 9.25%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 9.25%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  | $ 25 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | 25 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Annual dividend rate per share (in dollars per share) |  | $ 2.3125 us-gaap_PreferredStockDividendRatePerDollarAmount / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |  |
Series A preferred shares | Change in control provision | Maximum |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Ratio for conversion |  | 5.92417 inn_StockConversionRatio / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementScenarioAxis = inn_ChangeInControlProvisionPreferredStockMember |  |  |  |  |  |  |  |
Series B preferred shares |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 3,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 3,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  | 3,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Preferred stock, dividend rate (as a percent) |  | 7.875%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 7.875%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  | $ 25 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  | 25 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Annual dividend rate per share (in dollars per share) |  | $ 1.96875 us-gaap_PreferredStockDividendRatePerDollarAmount / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |
Series B preferred shares | Change in control provision | Maximum |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Ratio for conversion |  | 5.6497 inn_StockConversionRatio / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementScenarioAxis = inn_ChangeInControlProvisionPreferredStockMember |  |  |  |  |  |  |  |
Series C preferred shares |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
New issued stock (in shares) |  |  |  | 3,400,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |
Proceeds from equity offerings, net of offering costs |  |  |  | 81,700,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |
Underwriting discount and offering-related expenses |  |  |  | 3,300,000 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |
Preferred stock, shares authorized |  | 3,400,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 3,400,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  | 3,400,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |
Preferred stock, dividend rate (as a percent) |  | 7.125%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 7.125%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  | $ 25 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  | 25 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |
Annual dividend rate per share (in dollars per share) |  | $ 1.78125 us-gaap_PreferredStockDividendRatePerDollarAmount / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |  |
Series C preferred shares | Change in control provision | Maximum |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Ratio for conversion |  | 5.1440 inn_StockConversionRatio / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementScenarioAxis = inn_ChangeInControlProvisionPreferredStockMember |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Shares of common stock issued to redeem common units | 2,466,404 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 198,292 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Shares issued | 325,758 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 319,590 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Common Stock | Stock Options |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Shares issued |  | 4,253 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Common Stock | Executive officers and employees |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Stock issued to officers and directors (in shares) |  |  |  |  | 278,916 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TitleOfIndividualAxis = inn_ExecutiveOfficerAndEmployeesMember |  |  |  |  |
Stock forfeited (in shares) |  |  |  |  |  | 1,756 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TitleOfIndividualAxis = inn_ExecutiveOfficerAndEmployeesMember |  |  |  |
Common Stock | Executive officers |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Stock issued to officers and directors (in shares) |  |  |  |  |  |  | 292,090 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember |  |  |
Common Stock | Director |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Stock issued to officers and directors (in shares) |  | 32,317 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |  |  |  | 29,228 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |
Shares issued in lieu of cash for director fees | 4,440 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | 5,860 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |  |  |  |  |  |
Common Stock | Public offering |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
New issued stock (in shares) |  |  |  |  |  |  |  |  | 17,250,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = inn_PublicOfferingMember | 17,250,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = inn_PublicOfferingMember
Proceeds from equity offerings, net of offering costs |  |  |  |  |  |  |  |  | 152,000,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = inn_PublicOfferingMember |
Underwriting discount and offering-related expenses |  |  |  |  |  |  |  |  | $ 6,500,000 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = inn_PublicOfferingMember | $ 7,200,000 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = inn_PublicOfferingMember

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