XML 84 R70.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Equity Incentive Plans - Company's Equity Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 7 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 22, 2017 | Apr. 13, 2016 | Apr. 13, 2015 | May 09, 2016 | Jul. 11, 2014 | Jul. 31, 2016 | Aug. 22, 2017 | Sep. 12, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Equity Incentive Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  | 944,000 | 1,035,000 | 135,230 |
Number of shares vested during the period |  |  |  |  |  |  |  |  | 1,049,000 | 783,545 | 78,833 |
Shares cancelled |  |  |  |  |  |  |  |  |  | 1,685 |  |
Dividends on non-vested shares |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |
Share based compensation |  |  |  |  |  |  |  |  | $ 9,267 | $ 4,166 | $ 2,684 |
Number of options granted |  |  |  |  |  |  |  |  | 0 | 0 | 104,250 |
Total unrecognised compensation cost relating to non-vested share option |  |  |  |  |  |  |  |  | $ 336 |  |  |
Total unrecognised compensation cost relating to restricted share awards |  |  |  |  |  |  |  |  | $ 856 |  |  |
Weighted average remaining term for non-vested share option awards |  |  |  |  |  |  |  |  | 2 years 3 months 12 days |  |  |
Weighted average remaining term for non-vested restricted share awards |  |  |  |  |  |  |  |  | 7 months 14 days |  |  |
Unvested shares |  |  |  |  |  |  |  |  | 280,000 | 385,000 | 135,230 | 78,833
Total fair value of shares vested during the period |  |  |  |  |  |  |  |  | $ 12,023 | $ 3,580 | $ 1,301 |
Equity Incentive Plan 2015 |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance |  |  | 280,000 |  |  |  |  |  |  |  |  |
Number of shares granted |  |  | 135,230 |  |  |  |  |  |  |  |  |
Grant date fair value |  |  | $ 17.75 |  |  |  |  |  |  |  |  |
Number of shares vested during the period |  | 135,230 |  |  |  |  |  |  |  |  |  |
Equity Incentive Plan 2016 |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance |  |  |  | 940,000 |  |  |  |  |  |  |  |
Number of shares granted |  |  |  | 690,000 |  |  |  |  |  |  |  |
Vesting date |  |  |  |  |  |  |  |  | Mar. 01, 2018 |  |  |
Grant date fair value |  |  |  | $ 3.75 |  |  |  |  |  |  |  |
Number of shares vested during the period |  |  |  |  |  | 650,000 |  |  |  |  |  |
Unvested shares |  |  |  |  |  |  |  |  | 40,000 |  |  |
Equity Incentive Plan 2017 |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance | 950,000 |  |  |  |  |  |  |  |  |  |  |
Number of shares granted | 944,000 |  |  |  |  |  |  |  |  |  |  |
Vesting date |  |  |  |  |  |  |  |  | Aug. 22, 2018 |  |  |
Grant date fair value | $ 9.59 |  |  |  |  |  |  |  |  |  |  |
Number of shares vested during the period |  |  |  |  |  |  | 744,000 |  |  |  |  |
Unvested shares |  |  |  |  |  |  |  |  | 200,000 |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  | 104,250 |  |  |  |  |  |  |  |  |
Option exercise price |  |  | $ 27.5 |  |  |  |  |  |  |  |  |
Fair value assumptions - Expected term |  |  | 5 years |  |  |  |  |  |  |  |  |
Fair value assumptions - Expected volatility rate |  |  | 59.274% |  |  |  |  |  |  |  |  |
Fair value assumptions - Risk free interest rate |  |  | 1.30% |  |  |  |  |  |  |  |  |
Two directors |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  | 3,000 |  |  |  |  |  |  |
Number of shares vested during the period |  |  |  |  | 3,000 |  |  |  |  |  |  |
Directors and officers |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  | 345,000 |  |  |  |
Grant date fair value |  |  |  |  |  |  |  | $ 4.94 |  |  |  |
Directors and officers | First installment |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting date |  |  |  |  |  |  |  |  | Mar. 30, 2017 |  |  |
Unvested shares |  |  |  |  |  |  |  |  | 305,000 |  |  |
Directors and officers | Second installment |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting date |  |  |  |  |  |  |  |  | Mar. 01, 2018 |  |  |
Unvested shares |  |  |  |  |  |  |  |  | 40,000 |  |  |

X
- Definition Date which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in CCYY-MM-DD format. + References No definition available. + Details
Name: | sblk_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDate
Namespace Prefix: | sblk_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References No definition available. + Details
Name: | sblk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue
Namespace Prefix: | sblk_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate number of common shares reserved for future issuance. + 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 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of paid and unpaid cash dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units. + References No definition available. + Details
Name: | us-gaap_DividendsShareBasedCompensationCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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 Gross number of share options (or share units) granted during the period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PlanNameAxis=sblk_EquityIncentivePlan2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=sblk_EquityIncentivePlan2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=sblk_EquityIncentivePlan2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=sblk_TwoDirectorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=sblk_DirectorsOfficersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |