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Loans Receivable and Other Lending Investments, net (Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Available-for-Sale Securities
Available-for-sale Securities, Net Unrealized Gain (Loss)	$ 153us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax	$ 147us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Investments, Debt and Equity Securities [Abstract]
Face Value	175,237star_DebtSecuritiesFaceAmount	177,274star_DebtSecuritiesFaceAmount
Amortized Cost Basis	187,774star_DebtSecuritiesAmortizedCostBasis	187,524star_DebtSecuritiesAmortizedCostBasis
Estimated Fair Value	194,208star_DebtSecuritiesFairValue	191,366star_DebtSecuritiesFairValue
Net Carrying Value	187,927star_DebtSecuritiesNetCarryingAmount	187,671star_DebtSecuritiesNetCarryingAmount
Municipal Bonds
Available-for-Sale Securities
Available-for-sale Securities, Face Value	1,010star_AvailableforsaleSecuritiesDebtSecurityFaceAmount / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember	1,020star_AvailableforsaleSecuritiesDebtSecurityFaceAmount / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember
Available-for-sale Securities, Amortized Cost Basis	1,010us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember	1,020us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember
Available-for-sale Securities, Net Unrealized Gain (Loss)	153us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember	147us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember
Available-for-sale Securities, Debt Securities, Fair Value	1,163star_AvailableforsaleSecuritiesDebtSecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember	1,167star_AvailableforsaleSecuritiesDebtSecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember
Available-for-sale Securities, Debt Securities	1,163us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember	1,167us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember
Corporate Debt Securities
Held-to-Maturity Securities
Held-to-Maturity Securities, Face Value	174,227star_HeldtomaturitySecuritiesDebtSecurityFaceAmount / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember	176,254star_HeldtomaturitySecuritiesDebtSecurityFaceAmount / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember
Held-to-Maturity Securities, Amortized Cost Basis	186,764us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember	186,504us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember
Held-to-maturity Securities, Fair Value	193,045us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember	190,199us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember
Held-to-maturity Securities	$ 186,764us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember	$ 186,504us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember

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