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Derivatives (Foreign Exchange Contracts) (Details) | 3 Months Ended
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Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Mar. 31, 2015 Sells euro (EUR)/Buys USD Forward USD ($) | Mar. 31, 2015 Sells euro (EUR)/Buys USD Forward EUR (€) | Mar. 31, 2015 Sells Indian rupee (INR)/Buys USD Forward USD ($) | Mar. 31, 2015 Sells Indian rupee (INR)/Buys USD Forward INR | Mar. 31, 2015 Sells pound sterling (GBP)/Buys USD Forward USD ($) | Mar. 31, 2015 Sells pound sterling (GBP)/Buys USD Forward GBP (£) | Mar. 31, 2015 Sells Canadian dollar (CAD)/Buys USD Forward USD ($) | Mar. 31, 2015 Sells Canadian dollar (CAD)/Buys USD Forward CAD
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  | $ 15,482,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsEurBuysUsdForwardMember | € 13,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsEurBuysUsdForwardMember | $ 6,534,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsINRBuysUSDForwardMember | 456,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsINRBuysUSDForwardMember | $ 4,548,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsGbpBuysUsdForwardMember | £ 3,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsGbpBuysUsdForwardMember | $ 8,475,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsCadBuysUsdForwardMember | 10,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsCadBuysUsdForwardMember
Maturity of Foreign Currency Derivatives |  |  | Apr. 07, 2015 | Apr. 07, 2015 | Jun. 30, 2015 | Jun. 30, 2015 | Apr. 07, 2015 | Apr. 07, 2015 | Apr. 07, 2015 | Apr. 07, 2015
Foreign currency transaction gain (loss) | $ 0 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ 300,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |  |  |  |  |  |  |  |

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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 Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition Date the foreign currency exchange rate derivatives mature or expire, in CCYY-MM-DD format. + References No definition available. + Details
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