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Accrued Liabilities, detail (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accrued Liabilities [Abstract]
Interest on long-term debt	$ 4,225	$ 2,361
Vessels’ operating and voyage expenses	1,808	1,009
Commissions	139	143
Interest on derivatives and other finance expenses	566	65
General and administrative expenses	145	88
Total	$ 6,883	$ 3,666

X

- Definition

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.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

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X

- Definition

The carrying value as of the balance sheet date of accrued commissions (address and brokerage) that has been incurred and is unpaid.

+ References

No definition available.

+ Details

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

X

- Definition

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.

+ References

No definition available.

+ Details

Name:	sb_AccuredGeneralAndAdministrativeExpense
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- References

No definition available.

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X

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e7018-107765

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765

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