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Equity (Details 4) (USD $) | 1 Months Ended | 6 Months Ended
--- | --- | ---
May 31, 2012 | Jun. 30, 2013
Stock Repurchase Program |  |
Repurchase of common stock, authorized amount | $ 20,000,000 |
Available repurchase of common stock, authorized amount |  | $ 16,000,000

X
- Details
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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