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Advances for Vessels, detail (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Advances For Assets Acquisition And Assets Under Construction |  |
Advances for vessels, beginning balance | $ 3,653 | $ 13,007
Additions for advances, including capitalized expenses and interest | 65,425 | 58,150
Transferred to vessel cost | (60,482) | (67,504)
Advances for vessels, ending balance | $ 8,596 | $ 3,653

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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 Payments of installments associated with acquisition of vessels including advances paid for vessels under construction and certain capitalized expenses, interest and accrued vessel cost. + References No definition available. + Details
Name: | sb_AdvancesPaidCapitalizedExpensesAndInterestAndAccruedVesselCost
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration