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Risk Management and Derivatives (Interest Rate Hedges) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Oct. 31, 2012
Derivative [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	$ (3,634,000)us-gaap_DerivativeNetHedgeIneffectivenessGainLoss	[1]
Interest rate cap
Derivative [Line Items]
Derivative, Notional Amount	500,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateCapMember
Derivative, Cap Interest Rate	1.00%us-gaap_DerivativeCapInterestRate / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateCapMember
Interest rate swap
Derivative [Line Items]
Derivative, Variable Interest Rate	2.00%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_DerivativeByNatureAxis = star_InterestRateSwapOneMember
Derivative, Notional Amount	27,456,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_InterestRateSwapOneMember
Notional Amount			28,000,000us-gaap_DerivativeAmountOfHedgedItem / us-gaap_DerivativeByNatureAxis = star_InterestRateSwapOneMember
Derivative, Fixed Interest Rate	3.47%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = star_InterestRateSwapOneMember
Terminated Interest Rate Swap
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	100,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths / us-gaap_DerivativeByNatureAxis = star_TerminatedInterestRateSwapMember
Interest rate swaps
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 700,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember
[1] For the year ended December 31, 2014, $3,634 is included in "Other expense" on the Company's Consolidated Statements of Operations (see Note 10) and $420 is included in "Earnings from equity method investments" on the Company's Consolidated Statements of Operations. Included in "Interest expense" on the Company's Consolidated Statements of Operations are $62, $310 and $(44) for years ended December 31, 2014, 2013 and 2012, respectively.

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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Namespace Prefix:	invest_
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X

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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X

- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

+ Details

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X

- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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X

- Definition

Amount of gain (loss) from the ineffectiveness of the hedge.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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