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v3.19.1

Commitments and Contingencies, textual (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Maximum covered by insurance | $ 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