Early redelivery (cost)/income (Details) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($)
Early Redelivery (Cost) Income
Early redelivery income	$ 7,470
Cash compensation	7,990
Accrued revenue	$ 435

Cash compensation, net of commissions related to the termination of a contract between the parties.

No definition available.

Name:	sb_CashCompensationOnContractTerminationNet
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration