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Loans Receivable and Other Lending Investments, net (Credit Characteristics by Payment Status) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 loans		Dec. 31, 2013
Recorded investment in loans, aged by payment status and presented by class
Current	$ 1,199,646us-gaap_FinancingReceivableRecordedInvestmentCurrent
Less Than and Equal to 90 Days	0star_FinancingReceivableRecordedInvestmentEqualToLessThan90DaysPastDue
Greater Than 90 Days	96,057star_FinancingReceivableRecordedInvestmentGreaterThan90DaysPastDue	[1]
Total Past Due	96,057us-gaap_FinancingReceivableRecordedInvestmentPastDue
Total	1,295,703us-gaap_NotesReceivableNet		1,611,927us-gaap_NotesReceivableNet
Financing receivable, number of loans greater than 90 days past due	3star_FinancingReceivableNumberofLoansGreaterthan90DaysPastDue
Financing receivables, past due time period	90 days
Senior mortgages
Recorded investment in loans, aged by payment status and presented by class
Current	644,190us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Less Than and Equal to 90 Days	0star_FinancingReceivableRecordedInvestmentEqualToLessThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Greater Than 90 Days	96,057star_FinancingReceivableRecordedInvestmentGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember	[1]
Total Past Due	96,057us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Total	740,247us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Subordinate mortgages
Recorded investment in loans, aged by payment status and presented by class
Current	53,836us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember
Less Than and Equal to 90 Days	0star_FinancingReceivableRecordedInvestmentEqualToLessThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember
Greater Than 90 Days	0star_FinancingReceivableRecordedInvestmentGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember
Total Past Due	0us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember
Total	53,836us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember
Corporate/Partnership loans
Recorded investment in loans, aged by payment status and presented by class
Current	501,620us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
Less Than and Equal to 90 Days	0star_FinancingReceivableRecordedInvestmentEqualToLessThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
Greater Than 90 Days	0star_FinancingReceivableRecordedInvestmentGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
Total Past Due	0us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
Total	$ 501,620us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
Minimum
Recorded investment in loans, aged by payment status and presented by class
Financing receivables, past due time period	5 years
Maximum
Recorded investment in loans, aged by payment status and presented by class
Financing receivables, past due time period	6 years
[1] As of December 31, 2014, the Company had three loans which were greater than 90 days delinquent and were in various stages of resolution, including legal proceedings, environmental concerns and foreclosure-related proceedings, and ranged from 5.0 to 6.0 years outstanding.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524

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Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524

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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



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-Publisher SEC

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-Number 210

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