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Equity (Details 4) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	May 31, 2012	Mar. 31, 2013
Stock Repurchase Program
Repurchase of common stock, authorized amount	$ 20.0
Available repurchase of common stock, authorized amount		$ 16.0

X

- Details

Name:	sfi_StockRepurchaseProgramAbstract
Namespace Prefix:	sfi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration