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Net Investment in Sales-type Leases and Ground Lease Receivables - Ground Lease Receivable by Year of Origination (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Lessor, Lease, Description [Line Items]
2023	$ 19,245
2022	698,475
2021	274,085
2020	180,739
2019	450,123
Total	1,622,667
Stabilized properties
Lessor, Lease, Description [Line Items]
2023	19,106
2022	152,966
2021	171,664
2020	180,739
2019	450,123
Total	974,598
Development properties
Lessor, Lease, Description [Line Items]
2023	139
2022	545,509
2021	102,421
Total	$ 648,069

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	safe_
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Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	safe_
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X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
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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

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Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-3

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- Details

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- Details

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