XML 72 R56.htm IDEA: XBRL DOCUMENT
v3.19.1

Share Capital, Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 | Apr. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2014 | May 31, 2014 | Jun. 30, 2013 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tender offer preferred stock redemption |  |  |  |  |  |  | $ 0 | $ 24,890 | $ 0 |  |
Preferred deemed dividend |  |  |  |  |  |  | $ 0 | $ 2,146 | $ 0 |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price (in USD per share) | $ 25.00 |  |  |  |  |  |  |  |  |  |
Stock repurchased and retired (in shares) |  |  |  |  |  |  |  |  |  | 114,232 |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  | 0 | 379,514 |  | 0 |
Stock redeemed (in shares) | 379,514 |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price (in USD per share) |  |  |  |  |  |  | $ 25 |  |  | $ 25 |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 20,000
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Future redeemable securities |  |  |  |  |  |  | $ 58,305 |  |  | $ 58,305 |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  | 2,300,000 | 2,300,000 |  | 2,300,000 |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Future redeemable securities |  |  |  |  |  |  | $ 81,120 |  |  | $ 81,120 |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  | 3,200,000 | 3,200,000 |  | 3,200,000 |
June 2013 Public Offering |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from public offering and private placement |  |  |  |  |  | $ 38,865 |  |  |  |  |
Underwriting discount |  |  |  |  |  | 672 |  |  |  |  |
Offering expenses |  |  |  |  |  | $ 463 |  |  |  |  |
June 2013 Public Offering | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  |  |  | 800,000 |  |  |  |  |
Share price (in USD per share) |  |  |  |  |  | $ 25 |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  | 8.00% |  |  |  |  |
Dividends in arrears (in USD per share) |  |  |  |  |  | $ 2 |  |  |  |  |
Redemption date |  |  |  |  |  | Jun. 30, 2016 |  |  |  |  |
Redemption price (in USD per share) |  |  |  |  |  | $ 25 |  |  |  |  |
Private Placement | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  |  |  | 800,000 |  |  |  |  |
Private Placement | Common Class A |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  | 2,727,272 |  |  |  |  |  |  |  |
May 2014 Public Offering |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from public offering and private placement |  |  |  |  | $ 55,504 |  |  |  |  |  |
Underwriting discount |  |  |  |  | 1,744 |  |  |  |  |  |
Offering expenses |  |  |  |  | $ 252 |  |  |  |  |  |
May 2014 Public Offering | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  |  | 2,300,000 |  |  |  |  |  |
Share price (in USD per share) |  |  |  |  | $ 25 |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 8.00% |  |  |  |  |  |
Dividends in arrears (in USD per share) |  |  |  |  | $ 2 |  |  |  |  |  |
Redemption price (in USD per share) |  |  |  |  | $ 25 |  |  |  |  |  |
June 2014 Public Offering |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from public offering and private placement |  |  |  | $ 77,420 |  |  |  |  |  |  |
Underwriting discount |  |  |  | 2,369 |  |  |  |  |  |  |
Offering expenses |  |  |  | $ 211 |  |  |  |  |  |  |
June 2014 Public Offering | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  | 3,200,000 |  |  |  |  |  |  |
Share price (in USD per share) |  |  |  | $ 25 |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  | 8.00% |  |  |  |  |  |  |
Dividends in arrears (in USD per share) |  |  |  | $ 2 |  |  |  |  |  |  |
Redemption price (in USD per share) |  |  |  | $ 25 |  |  |  |  |  |  |
April 2017 tender offer |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tender offer preferred stock redemption |  | $ 24,891 |  |  |  |  |  |  |  |  |
Preferred deemed dividend |  | $ 2,146 |  |  |  |  |  |  |  |  |
April 2017 tender offer | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price (in USD per share) |  | $ 22.50 |  |  |  |  |  |  |  |  |
Stock repurchased and retired (in shares) |  | 1,106,254 |  |  |  |  |  |  |  |  |
Percentage of tender acceptance |  | 74.46% |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  | 1,485,768 |  |  |  |  |  |  |  |  |
April 2017 tender offer | Common Class A |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  | 2,212,508 |  |  |  |  |  |  |  |  |
Maximum | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  | 25.00% | 30.00% |  |  |  |

X
- Definition The cash outflow for the Tender offer-redemption of preferred stock. + References No definition available. + Details
Name: | sb_PaymentOfTenderOfferPreferredStockRedemption
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | sb_PercentageOfTenderAcceptance
Namespace Prefix: | sb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Preferred deemed dividend is the difference recorded between (i) the cash paid to the preferred shareholders and the fair value of issued common shares and (ii) the carrying amount of the preferred stock immediately before the exchange net of issuance costs. + References No definition available. + Details
Name: | sb_PreferredDeemedDividend
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation, net of offering expenses. + References No definition available. + Details
Name: | sb_ProceedsFromIssuanceOfPreferredStockNetOfOfferingExpenses
Namespace Prefix: | sb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfStockIssuanceCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Discount on preferred shares, or any unamortized balance thereof, shown separately as a deduction from the applicable account(s) as circumstances require. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.4-07) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187103-122770 + Details
Name: | us-gaap_PreferredStockDiscountOnShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount of cumulative preferred dividends in arrears. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21488-112644 + Details
Name: | us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The redemption (or callable) amount of redeemable preferred stock, excluding currently redeemable preferred stock. Includes amounts representing dividends not declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer. + References No definition available. + Details
Name: | us-gaap_PreferredStockRedemptionAmountFutureRedeemableSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Date the preferred stock has been redeemed, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21564-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 + Details
Name: | us-gaap_PreferredStockRedemptionDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21488-112644 + Details
Name: | us-gaap_PreferredStockRedemptionPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PreferredStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
Name: | us-gaap_StockRedeemedOrCalledDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesBPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesDPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sb_EntitySaleOfStockAxis=sb_June2013PublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sb_EntitySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sb_EntitySaleOfStockAxis=sb_May2014PublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sb_EntitySaleOfStockAxis=sb_June2014PublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sb_EntitySaleOfStockAxis=sb_April2017TenderOfferMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |