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Revenues, detail (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues [Abstract] |  |  |
Time charter revenue | $ 191,977 | $ 146,533 | $ 108,487
Voyage charter revenue | 1,113 | 1,095 | 0
Other income | 8,458 | 6,412 | 5,472
Total | $ 201,548 | $ 154,040 | $ 113,959

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- 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

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- 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

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_RevenuesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration