Name:	sb_AccruedCommissions
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Carrying value as of the balance sheet date of accrued expenses in the form of management fees in exchange of services and the accrued expenses for managing and administering the affairs of an entity, that has been incurred and is unpaid.

No definition available.

Name:	sb_AccruedGeneralAndAdministrativeExpense
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Carrying value as of the balance sheet date of [accrued] interest on derivatives payable on all forms of derivative instruments that has been incurred and is unpaid and carrying value as of the balance sheet date of the accrued other financial expenses.

No definition available.

Name:	sb_AccruedInterestOnDerivativesAndOtherFinancialExpenses
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Carrying value as of the balance sheet date of [accrued] vessel' operating and voyage expenses , that has been incurred and is unpaid. Used to reflect the current portion of the liabilities due within one year.

No definition available.

Name:	sb_AccruedVesselOperatingAndVoyageExpenses
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Name:	us-gaap_AccruedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

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

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).