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Loans Receivable and Other Lending Investments, net (Reserve for Loan Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Allowance for Loan Losses [Roll Forward] |  |  |  |
Reserve for loan losses at beginning of period | $ 69,466 | $ 79,389 | $ 78,489 | $ 85,545
Provision for (recovery of) loan losses | 18,892 | (600) | 18,037 | (5,528)
Charge-offs | (33,863) | 0 | (42,031) | (1,228)
Reserve for loan losses at end of period | $ 54,495 | $ 78,789 | $ 54,495 | $ 78,789

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- References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Reflects the amount of loans that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities. + References No definition available. + Details
Name: | star_AllowanceForLoanLossesWriteOffs
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Allowance for Loan and Lease Loss, Recovery of Bad Debts, Net of (Provision for Loan and Lease Losses) + References No definition available. + Details
Name: | star_AllowanceforLoanandLeaseLossRecoveryofBadDebtsNetofProvisionforLoanandLeaseLosses
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant