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Transactions with Related Parties, textual (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Sale of vessels and novation of newbuild contracts [Line Items] |  |
Remaining Commitment For New build | $ 48,155 |
Fair Value of Newbuild | 46,000 |
Stalo |  |
Sale of vessels and novation of newbuild contracts [Line Items] |  |
Vessel Agreed Sale Price |  | $ 9,000
Sales Fees |  | 0
Kypros Unity |  |
Sale of vessels and novation of newbuild contracts [Line Items] |  |
Vessel Agreed Sale Price |  | 20,000
Sales Fees |  | 0
Hull No. 1718 |  |
Sale of vessels and novation of newbuild contracts [Line Items] |  |
Remaining Commitment For New build |  | 28,400
Fair Value of Newbuild |  | $ 26,500
Hull No. 835 |  |
Sale of vessels and novation of newbuild contracts [Line Items] |  |
Fair Value of Newbuild | 21,500 |
Sales Fees | 0 |
Hull No. 1551 |  |
Sale of vessels and novation of newbuild contracts [Line Items] |  |
Fair Value of Newbuild | 24,500 |
Sales Fees | $ 0 |

X
- Definition The fair value of a newbuild vessel representing the higher of the two appraisals obtained from independent third parties. + References No definition available. + Details
Name: | sb_FairValueOfCommitmentForNewbuild
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of the remaining commitment maturing in the remainder of the fiscal years in order to complete a newbuild vessel as of the day of signing the novation agreement. + References No definition available. + Details
Name: | sb_RemainingCommitmentForNewBuild
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of expense derived from the sales fee. + References No definition available. + Details
Name: | sb_SalesFeesExpense
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The agreed sale price which the buyers will pay and which represents the higher of the two appraisals for that vessel obtained from independent third parties. + References No definition available. + Details
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Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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