XML 53 R43.htm IDEA: XBRL DOCUMENT v3.25.1

Summary of Significant Accounting Policies - Redeemable Noncontrolling Interests (Details) - Caret Units $ in Millions	1 Months Ended
	Feb. 28, 2022 USD ($) director shares
Subsidiary, Sale of Stock [Line Items]
Number of units sold | shares	108,571
Number of shares to be sold under purchase commitment related to merger | shares	28,571
Proceeds from stock transaction | $	$ 19.0
Expected proceeds from sale of shares under purchase commitment | $	$ 5.0
Number of independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest | director	1
Period in which the entity is obligated to provide a public market listing	2 years

X

- Definition

Number of independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest.

+ References

No definition available.

+ Details

Name:	safe_NumberOfDirectorsAffiliatedWithShareholderInvestingInRedeemableNoncontrollingInterest
Namespace Prefix:	safe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The period of time in which the entity is obligated to provide a public market listing under terms of investor unit sales agreement.

+ References

No definition available.

+ Details

Name:	safe_PeriodInWhichToProvidePublicMarketListing
Namespace Prefix:	safe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The expected proceeds from sale of shares under purchase commitment.

+ References

No definition available.

+ Details

Name:	safe_SaleOfStockExpectedProceedsFromSaleOfSharesUnderPurchaseCommitment
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of shares to be issued or sold by the subsidiary or equity method investee under a purchase commitment..

+ References

No definition available.

+ Details

Name:	safe_SaleOfStockNumberOfSharesToBeIssuedUnderBindingPurchaseCommitment
Namespace Prefix:	safe_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-03(i)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3

+ Details

Name:	us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=safe_CaretUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: