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Revenues, detail (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
REVENUES:
Time charter revenue	$ 105,767	$ 118,593	$ 142,461
Voyage charter revenue	0	0	914
Ballast bonus	2,720	9,901	13,375
Other income	5,472	3,881	3,150
Total	$ 113,959	$ 132,375	$ 159,900

X

- Definition

Revenues generated from ballast bonus, which is an amount paid by the charterer for repositioning the vessel at the charterers disposal.

+ References

No definition available.

+ Details

Name:	sb_BallastBonus
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Revenues generated from charterers for the time or voyage charter hire of vessels.Revenues from time charter may also include ballast bonus, which is an amount paid by the charterer for repositioning the vessel at the charterers disposal, and other miscellaneous revenues from vessel operations.

+ References

No definition available.

+ Details

Name:	sb_TimeCharterAndVoyageRevenue
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Revenues generated from charterers for the time charter hire of vessels which implies a contract made for the use of a vessel for a specific period of time and at a specified daily charter rate.

+ References

No definition available.

+ Details

Name:	sb_TimeCharterRevenue
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Revenues generated from voyage charter hire of vessels which implies a contract made for the use of a vessel under which freight is paid on the basis of moving cargo from a loading port to a discharge port.

+ References

No definition available.

+ Details

Name:	sb_VoyageCharterRevenue
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue and income classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.4)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

+ Details

Name:	us-gaap_OtherIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenuesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration