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Real Estate (Allowance for doubtful accounts) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Real Estate [Abstract]
Allowance for doubtful accounts related to real estate tenant receivables	$ 5.7	$ 5.6

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- Definition

Represents the allowance for doubtful accounts related to tenant receivables, including deferred operating lease income receivable.

+ References

No definition available.

+ Details

Name:	sfi_AllowanceForDoubtfulAccountsRelatedToTenantReceivables
Namespace Prefix:	sfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_RealEstateAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration