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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Loans modified through troubled debt restructurings	$ 8,100,000us-gaap_FinancingReceivableModificationsRecordedInvestment			$ 10,400,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Average Recorded Investment	138,359,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment		720,118,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Interest Income Recognized	26,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod		619,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod
Senior mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	130,491,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember		626,553,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Interest Income Recognized	17,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember		554,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	7,868,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember		93,565,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
Interest Income Recognized	9,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember		65,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		48,512,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
Interest Income Recognized	0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		501,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
With no related allowance recorded | Senior mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		48,512,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
Interest Income Recognized	0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		501,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
With an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	137,045,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]		139,672,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Unpaid Principal Balance	136,164,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]		138,801,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Related Allowance	(64,783,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]		(64,990,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Average Recorded Investment	138,359,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		671,606,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Interest Income Recognized	26,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		118,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
With an allowance recorded | Senior mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	130,336,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]		130,645,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Unpaid Principal Balance	129,428,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]		129,744,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Related Allowance	(64,440,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]		(64,440,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Average Recorded Investment	130,491,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		578,041,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Interest Income Recognized	17,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		53,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
With an allowance recorded | Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,709,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]		9,027,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Unpaid Principal Balance	6,736,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]		9,057,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Related Allowance	(343,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]		(550,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Average Recorded Investment	7,868,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		93,565,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Interest Income Recognized	$ 9,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		$ 65,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
[1] All of the Company's non-accrual loans are considered impaired and included in the table above. In addition, as of March 31, 2015 and December 31, 2014, certain loans modified through troubled debt restructurings with a recorded investment of $8.1 million and $10.4 million, respectively, are also included as impaired loans in accordance with GAAP although they are performing and on accrual status. The Company did not have impaired loans with no related allowance recorded.

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- Definition

The interest income recognized on a cash-basis or accrual method of accounting during the time within that period that the financing receivables were impaired.

+ References

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

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-Publisher FASB

-Name Accounting Standards Codification

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