Name:	sb_CostOfLubricants
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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
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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
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

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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
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

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

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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
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Period Type:	duration

- References

No definition available.

Name:	us-gaap_OperatingExpensesAbstract
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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://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(7)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2