XML 223 R45.htm IDEA: XBRL DOCUMENT
v3.25.3

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
Proceeds from stock transaction | $ | $ 19.0
Number of independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest | director | 1
Number of shares to be sold under purchase commitment related to merger | shares | 28,571
Expected proceeds from sale of shares under purchase commitment | $ | $ 5.0
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: |