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Net Investment in Sales-type Leases, Ground Lease Receivables and Loans Receivable, net - Related Party - Ground lease receivable by year of origination (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Lessor, Lease, Description [Line Items]
2022	$ 545,941
2021	263,898
2020	178,276
2019	443,558
Total	1,431,673
Stabilized properties
Lessor, Lease, Description [Line Items]
2022	521,172
2021	237,690
2020	178,276
2019	443,558
Total	1,380,696
Development properties
Lessor, Lease, Description [Line Items]
2022	24,769
2021	26,208
Total	$ 50,977

X

- Definition

Amount, before allowance for credit loss, of Ground Lease receivable.

+ References

No definition available.

+ Details

Name:	safe_GroundLeaseReceivable
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of gross ground lease receivables originated four years prior to current fiscal year.

+ References

No definition available.

+ Details

Name:	safe_GroundLeaseReceivableYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of gross ground lease receivables originated three years prior to current fiscal year.

+ References

No definition available.

+ Details

Name:	safe_GroundLeaseReceivableYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of gross ground lease receivables originated two years prior to current fiscal year.

+ References

No definition available.

+ Details

Name:	safe_GroundLeaseReceivableYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of gross ground lease receivables originated in fiscal year prior to current fiscal year.

+ References

No definition available.

+ Details

Name:	safe_GroundLeaseReceivableYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=safe_StabilizedPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: