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Risk Management and Derivatives (Interest Rate Hedges) (Details) (USD $) | 12 Months Ended |
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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.

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- 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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- 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 + Details
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- 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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- 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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- 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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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- 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 + Details
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