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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