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Fair value measurements and Hedging (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impairment loss | $ 3,411 | $ 0
Star Anna and Star Gamma |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impairment loss | 3,411 |
Quoted Prices in Active Markets for Identical Liabilities (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
2022 Notes fair value | $ 51,100 |

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