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Transactions with Related Parties, Schedule of Fees Charged by Managers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transactions [Abstract] |  |  |
Ship Management Fees | $ 18,050 | $ 16,536 | $ 13,511
Supervision Fees | 275 | 275 | 550
Commissions | $ 0 | $ 586 | $ 700

X
- Definition Commission Fees Expense + References No definition available. + Details
Name: | sb_CommissionFeesExpense
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense derived from the supervision fees. + References No definition available. + Details
Name: | sb_SupervisionFeesExpense
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration