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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		9 Months Ended	0 Months Ended
	May 28, 2014	Mar. 02, 2013	Sep. 30, 2014	Jun. 19, 2014	Dec. 31, 2013
Equity-based compensation
Vesting period	3 years	3 years
Number of Shares
Non-vested at the beginning of period (in shares)			268,174us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Granted (in shares)	161,935us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	185,572us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	161,935us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Vested (in shares)			45,551us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Non-vested at the end of period (in shares)			384,558us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Weighted Average Grant Date Fair Value
Non-vested at the beginning of period (in dollars per share)			$ 6.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Granted (in dollars per share)			$ 7.12us-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
Aggregate Current Value
Non-vested at the end of period			$ 4,146inn_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateCurrentValueNonvested		$ 2,414inn_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateCurrentValueNonvested
Severance and release agreement | Mr. Becker
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
Performance Period, one
Equity-based compensation
Designated performance period to measure performance based on which share based awards vests			1 year
Performance Period, two
Equity-based compensation
Designated performance period to measure performance based on which share based awards vests			2 years
Performance Period, three
Equity-based compensation
Designated performance period to measure performance based on which share based awards vests			3 years

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- Definition

Represents the designated performance period to measure performance based on which share based awards vests.

+ References

No definition available.

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- Definition

Represents the current value of equity-based compensation awards not vested. Excludes stock and unit options.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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