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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Statement of Comprehensive Income
Other income recognized due to hedge forecasted for permanent debt that did not occur	$ 15,191

X

- Definition

The amount of other income recognized due to a hedge forecasted for permanent debt that did not occur.

+ References

No definition available.

+ Details

Name:	safe_OtherIncomeRecognizedDueToHedgeForecastedForPermanentDebtThatDidNotOccur
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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