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Advances for Vessels, detail (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Advances For Assets Acquisition And Assets Under Construction
Advances for vessels, beginning balance	$ 3,653	$ 13,007
Additions for advances, including capitalized expenses and interest	65,425	58,150
Transferred to vessel cost	(60,482)	(67,504)
Advances for vessels, ending balance	$ 8,596	$ 3,653

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- Definition

Advances For Asset Acquisitions, Transfers And Changes

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Namespace Prefix:	sb_
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- Definition

Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service and advances and costs paid for assets under acquisition that have not been completed and delivered and not ready to be placed into service as at the balance sheet date.

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Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Namespace Prefix:	sb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Payments of installments associated with acquisition of vessels including advances paid for vessels under construction and certain capitalized expenses, interest and accrued vessel cost.

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No definition available.

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