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Transactions with Related Parties, detail 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Related Party Transactions |  |  |
Fixed and Variable fees | $ 11,611 | $ 10,764 | $ 8,962
Supervision Fees | 1,925 | 1,925 | 2,200
Acquisition Fees | $ 972 | $ 1,160 | $ 1,429

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

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