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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 | $ 8,100,000 us-gaap_FinancingReceivableModificationsRecordedInvestment |  |  | $ 10,400,000 us-gaap_FinancingReceivableModificationsRecordedInvestment |
Average Recorded Investment | 138,359,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment |  | 720,118,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment |  |
Interest Income Recognized | 26,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod |  | 619,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod |  |
Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 130,491,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember |  | 626,553,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember |  |
Interest Income Recognized | 17,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember |  | 554,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember |  |
Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 7,868,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember |  | 93,565,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember |  |
Interest Income Recognized | 9,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember |  | 65,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember |  |
With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 0 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 48,512,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  |
Interest Income Recognized | 0 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 501,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  |
With no related allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 0 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 48,512,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  |
Interest Income Recognized | 0 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 501,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  |
With an allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 137,045,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |  | 139,672,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1]
Unpaid Principal Balance | 136,164,000 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |  | 138,801,000 us-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 | 138,359,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 671,606,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  |
Interest Income Recognized | 26,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 118,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  |
With an allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 130,336,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |  | 130,645,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1]
Unpaid Principal Balance | 129,428,000 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |  | 129,744,000 us-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 | 130,491,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 578,041,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  |
Interest Income Recognized | 17,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 53,000 star_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 | 6,709,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |  | 9,027,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1]
Unpaid Principal Balance | 6,736,000 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |  | 9,057,000 us-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 | 7,868,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 93,565,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  |
Interest Income Recognized | $ 9,000 star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | $ 65,000 star_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 No definition available. + Details
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- Definition 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 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524 + Details
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