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Other long-term liabilities - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) vessel | Dec. 31, 2016 USD ($)
Subclassifications of assets, liabilities and equities [abstract] |  |
Undiscounted amount of estimated cash flows required to settle liabilities | $ 44.9 | $ 41.1
Number of vessels delivered | vessel | 2 |
Total finance lease payments | $ 30.6 |
Interest expense on finance leases | $ 23.7 |

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- Definition Number Of Vessels Delivered + References No definition available. + Details
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