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Real estate (Details 10) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Other income |  |  |
Real Estate Properties [Line Items] |  |  |
Reclassified results of operations | $ 21,148 | $ 21,663 | $ 22,751
Real estate expenses |  |  |
Real Estate Properties [Line Items] |  |  |
Reclassified results of operations | $ (22,603) | $ (24,297) | $ (25,612)

X
- Definition Reclassification of Results of Operations + References No definition available. + Details
Name: | sfi_ReclassificationOfResultsOfOperations
Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration