Name:	sb_ConsolidatedDebtConvenant
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Represent the maximum percentage of total consolidated liabilities divided by its total consolidated assets, based on the market value of all vessels owned or leased on a finance lease taking into account their employment and the book value of all other assets, applicable during the end of the current fiscal year and onwards.

No definition available.

Name:	sb_ConsolidatedLeverageCovenant
Namespace Prefix:	sb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Debt Instrument, Covenant, Maximum Debt To EBITDA Ratio for credit facilities outstanding with government owned export credit institutions.

No definition available.

Name:	sb_DebtInstrumentCovenantMaximumDebtToEBITDARatio
Namespace Prefix:	sb_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Debt Instrument, Covenant, Minimum EBITDA To Interest Expense

No definition available.

Name:	sb_DebtInstrumentCovenantMinimumEBITDAToInterestExpense
Namespace Prefix:	sb_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Represents the minimum percentage of shares that remain directly or indirectly benefially owned by the Hajioannou family for the duration of the relevant credit facilities.

No definition available.

Name:	sb_MinimumPercentageOfOwnership
Namespace Prefix:	sb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Minimum Value Covenant is minimum fair vessel value ratio to outstanding loan principal requirements applicable during the end of the current fiscal year and onwards.

No definition available.

Name:	sb_MinimumValueCovenant
Namespace Prefix:	sb_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Mininum cash balance of loan and credit facility agrrements as collateral deposit with restrictive liquidity covenant

No definition available.

Name:	sb_MininumCashBalanceOfLoanAndCreditFacilityAgrrementsAsCollateralDepositWithRestrictiveLiquidityCovenant
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the minimum amount of total consolidated assets, based on the market value of all vessels owned or leased on a finance lease taking into account their employment and the book value of all other assets, less total consolidated liabilities (Net Worth Covenant) applicable during the end of the current fiscal year and onwards.

No definition available.

Name:	sb_NetWorthCovenant
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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.

No definition available.

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

Weighted average interest rate of debt outstanding.

No definition available.

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Amount of interest capitalized during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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

Total interest costs incurred during the period and either capitalized or charged against earnings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DebtInstrumentAxis=sb_CommercialFinancingInstitutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DebtInstrumentAxis=sb_GovernmentOwnedExportCreditInstitutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CounterpartyNameAxis=sb_HajioannouFamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: