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Summary of Significant Accounting Policies - Interest Rate Derivatives (Details) (USD $)	Jan. 11, 2012	Dec. 31, 2014 instrument
Derivative
Notional Amount	$ 42,000,000invest_DerivativeNotionalAmount
Interest Rate Caps
Derivative
Number of Instruments		2us-gaap_NumberOfInterestRateDerivativesHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateCapMember
Notional Amount		92,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateCapMember
Interest Rate Swaps
Derivative
Number of Instruments		1us-gaap_NumberOfInterestRateDerivativesHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Notional Amount		$ 64,500,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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- Details

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Period Type:	duration

X

- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

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X

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- Details

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