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Advances for Vessels, detail (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Advances For Assets Acquisition And Assets Under Construction |  |
Advances for vessels, beginning balance | $ 8,596 | $ 3,653
Additions for advances, including capitalized expenses and interest | 50,423 | 65,425
Transferred to vessel cost | (39,725) | (60,482)
Advances for vessels, ending balance | $ 19,294 | $ 8,596

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- Definition Advances For Asset Acquisitions, Transfers And Changes + References No definition available. + Details
Name: | sb_AdvancesForAssetAcquisitionsTransfersAndChanges
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service and advances and costs paid for assets under acquisition that have not been completed and delivered and not ready to be placed into service as at the balance sheet date. + References No definition available. + Details
Name: | sb_AdvancesForAssetsAcquisitionAndAssetsUnderConstruction
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | sb_AdvancesForAssetsAcquisitionAndAssetsUnderConstructionAbstract
Namespace Prefix: | sb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Advances paid for vessels acquisitions, vessels under construction and vessel improvements and comprise payments of instalments that were due to the respective shipyard or third-party sellers, capitalized interest, certain capitalized expenses and expenditures for major improvements and regulatory compliance. + References No definition available. + Details
Name: | sb_AdvancesPaidCapitalizedExpensesAndInterestAndAccruedVesselCost
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration