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Fair Value Measurements and Hedging - Additional Information (Details) € in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Apr. 30, 2018 EUR (€)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Trading Symbol |  | SBLK |  |  |  |
Amount of cash held | $ 204,921 | $ 117,819 | $ 204,921 |  | $ 257,911 |
Foreign exchange gain/ (loss) |  |  | (3,159) |  |  |
Fair value hedge gain/ (loss) |  | 0 | 1,609 |  | 0 |
Impairment loss |  | $ 3,411 | 17,784 |  | $ 0 |
Bunker swaps | ING Bank N.V. |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Metric Tons |  | 84,000 |  |  |  |
Percentage of estimated annual fuel consumption |  | 10.00% |  |  |  |
Fixed bunker spread price |  | $ 266 |  |  |  |
Derivative, Description of Hedged Item |  | In December 2019, the Company also entered into a bunker swap with ING Bank N.V. to hedge 84,000 metric tons or approximately 10% of its estimated annual fuel consumption by selling the 2020 Singapore spread between Very Low-Sulfur Fuel Oil (VLSFO) – High-Sulfur Fuel Oil (HSFO) at $266 per ton. The effective date of the swap is January 1, 2020 and the maturity date is December 31, 2020. |  |  |  |
Inception date |  | Jan. 01, 2020 |  |  |  |
Maturity date |  | Dec. 31, 2020 |  |  |  |
8.30% 2022 Notes |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Trading Symbol |  | SBLKZ |  |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
2022 Notes fair value | 49,800 | $ 51,360 | 49,800 |  |  |
Fair value hedging |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Amount of cash held | € |  |  |  |  |  | € 70,800
Fair value hedge gain/ (loss) | $ 1,609 |  |  |  |  |
Ineffective portion of fair value hedge |  |  | $ 39 |  |  |
Payments for vessels upgrade | € |  |  |  | € 20,500 |  |
Fair value hedging | Fixed orders |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Amount of cash held | € |  |  |  |  |  | € 20,500
Percentage of coverage through foreign currency hedging |  |  |  |  |  | 100.00%
Fair value hedging | Optional orders |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Percentage of coverage through foreign currency hedging |  |  |  |  |  | 50.00%

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