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Commitments and Contingencies, textual (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Commitments And Contingencies Disclosure
Insurance Maximum Amount	$ 1,000,000

X

- Definition

The maximum amount of the liabilities associated with the individual vessel actions, mainly for sea pollution covered by P&I Club insurance.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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