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v3.23.1

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