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Loans Receivable and Other Lending Investments, net (Credit Characteristics for Performing Loans) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 1,295,703us-gaap_NotesReceivableNet | $ 1,611,927us-gaap_NotesReceivableNet
Senior mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 740,247us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember |
Subordinate mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 53,836us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember |
Corporate/Partnership loans |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 501,620us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember |
Real Estate Finance |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 1,166,465us-gaap_NotesReceivableNet / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 1,091,340us-gaap_NotesReceivableNet / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Weighted Average Risk Ratings | 3.23star_WeightedAverageRiskRatings / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 3.11star_WeightedAverageRiskRatings / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Real Estate Finance | Senior mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 611,009us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 591,145us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Weighted Average Risk Ratings | 2.73star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 2.50star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Real Estate Finance | Subordinate mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 53,836us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 61,364us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Weighted Average Risk Ratings | 2.87star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 3.37star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Real Estate Finance | Corporate/Partnership loans |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 501,620us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | $ 438,831us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Weighted Average Risk Ratings | 3.88star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 3.88star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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