Name:	sb_CostOfLubricants
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The aggregate costs of keeping the property in good condition including the repairs, maintenance and drydocking costs.

No definition available.

Name:	sb_CostOfPropertyRepairsMaintenanceAndDrydockingCosts
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Cost of labor directly related to good produced and service rendered. Includes, but is not limited to, payroll cost and equity-based compensation.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(2))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Costs of maintenance supplies used that are directly related to goods produced and sold, or services rendered, during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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Amount of tax incurred and cost of license directly related to good produced or service rendered.

Name:	us-gaap_DirectTaxesAndLicensesCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

No definition available.

Name:	us-gaap_OperatingCostsAndExpenses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

Name:	us-gaap_OperatingExpensesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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Insurance and claims costs directly related to goods produced and sold, or services rendered, during the reporting period.

Name:	us-gaap_OperatingInsuranceAndClaimsCostsProduction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227