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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 139,672,000us-gaap_ImpairedFinancingReceivableRecordedInvestment | [1] | $ 752,425,000us-gaap_ImpairedFinancingReceivableRecordedInvestment | [1] |
Unpaid Principal Balance | 138,801,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance | [1] | 747,522,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance | [1] |
Related Allowance | (64,990,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance | [1] | (348,004,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance | [1] |
Loans modified through troubled debt restructurings | 10,400,000us-gaap_FinancingReceivableModificationsRecordedInvestment |  | 231,800,000us-gaap_FinancingReceivableModificationsRecordedInvestment |  |
Average Recorded Investment | 422,973,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment |  | 943,761,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment |  | 1,350,704,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Interest Income Recognized | 2,261,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod |  | 17,618,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod |  | 7,102,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod
Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 130,645,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember | [1] | 653,349,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember | [1] |
Unpaid Principal Balance | 129,744,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember | [1] | 648,455,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember | [1] |
Related Allowance | (64,440,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember | [1] | (304,544,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember | [1] |
Average Recorded Investment | 370,010,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember |  | 825,656,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember |  | 1,226,138,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Interest Income Recognized | 2,080,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember |  | 11,245,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember |  | 6,630,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember |  | 32,382,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember |  | 52,208,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember
Interest Income Recognized | 0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember |  | 0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember |  | 0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember
Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 9,027,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember | [1] | 99,076,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember | [1] |
Unpaid Principal Balance | 9,057,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember | [1] | 99,067,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember | [1] |
Related Allowance | (550,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember | [1] | (43,460,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember | [1] |
Average Recorded Investment | 52,963,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember |  | 85,723,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember |  | 72,358,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
Interest Income Recognized | 181,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember |  | 6,373,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember |  | 472,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 35,659,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 39,471,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 172,203,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
Interest Income Recognized | 1,922,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 15,319,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 2,925,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
With no related allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember | [1] | 3,012,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember | [1] |
Unpaid Principal Balance | 0us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember | [1] | 2,992,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember | [1] |
Related Allowance | 0us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember | [1] | 0us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember | [1] |
Average Recorded Investment | 35,659,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 31,409,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 162,093,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
Interest Income Recognized | 1,922,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 9,269,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 2,765,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
With no related allowance recorded | Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 8,062,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 10,110,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
Interest Income Recognized | 0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 6,050,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember |  | 160,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
With an allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 139,672,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] | 749,413,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |
Unpaid Principal Balance | 138,801,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] | 744,530,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |
Related Allowance | (64,990,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] | (348,004,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |
Average Recorded Investment | 387,314,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 904,290,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 1,178,501,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Interest Income Recognized | 339,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 2,299,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 4,177,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
With an allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 130,645,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] | 650,337,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |
Unpaid Principal Balance | 129,744,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] | 645,463,000us-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] | (304,544,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |
Average Recorded Investment | 334,351,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 794,247,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 1,064,045,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Interest Income Recognized | 158,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 1,976,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 3,865,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
With an allowance recorded | Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 32,382,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 52,208,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Interest Income Recognized | 0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
With an allowance recorded | Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 9,027,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] | 99,076,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |
Unpaid Principal Balance | 9,057,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] | 99,067,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |
Related Allowance | (550,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] | (43,460,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember | [1] |
Average Recorded Investment | 52,963,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 77,661,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 62,248,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Interest Income Recognized | 181,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 323,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember |  | 312,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Nonperforming Financing Receivable [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired financing receivable, interest income, cash basis method | $ 0us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_NonperformingFinancingReceivableMember |  | $ 13,300,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_NonperformingFinancingReceivableMember |  |
[1] | All of the Company's non-accrual loans are considered impaired and included in the table above. In addition, as of December 31, 2014 and 2013, certain loans modified through troubled debt restructurings with a recorded investment of $10.4 million and $231.8 million, respectively, are also included as impaired loans in accordance with GAAP although they are performing and on accrual status.

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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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