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EQUITY-BASED COMPENSATION (Details 5) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity-based compensation expense      
Share based compensation $ 3,524,000us-gaap_AllocatedShareBasedCompensationExpense $ 2,124,000us-gaap_AllocatedShareBasedCompensationExpense $ 1,205,000us-gaap_AllocatedShareBasedCompensationExpense
Unrecognized compensation expense      
Unrecognized compensation costs related to non-vested awards 2,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Share based compensation non-vested awards period of recognition 10 months 24 days    
Compensation expense to be recognized      
2015 2,000,000inn_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNextTwelveMonths    
2016 700,000inn_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostYearTwo    
2017 100,000inn_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostYearThree    
Corporate general and administrative      
Equity-based compensation expense      
Share based compensation   1,781,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
1,085,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
Corporate general and administrative | Stock Options      
Equity-based compensation expense      
Share based compensation 675,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
622,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
700,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
Corporate general and administrative | Restricted Stock Awards      
Equity-based compensation expense      
Share based compensation 1,483,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
548,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
171,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
Corporate general and administrative | Restricted Stock Awards | Time-Based      
Equity-based compensation expense      
Share based compensation 960,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
611,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
214,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
Corporate general and administrative | Stock awards | Director      
Equity-based compensation expense      
Share based compensation $ 406,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
$ 343,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
$ 120,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
Common Stock | Director      
Equity-based compensation expense      
Stock issued to officers and directors (in shares) 32,317us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
29,228us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
 
Shares issued in lieu of cash for director fees 7,539us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
6,488us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember