Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Minimum Annual Payments for Non-Cancelable Ship Construction Contracts (Details 1)

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Commitments and Contingencies - Minimum Annual Payments for Non-Cancelable Ship Construction Contracts (Details 1) - Ship Construction Contracts
$ in Thousands
Dec. 31, 2017
USD ($)
Other Commitments [Line Items]  
2018 $ 1,016,892
2019 893,881
2020 469,334
2021 172,872
2022 968,340
Thereafter 2,616,900
Total minimum annual payments $ 6,138,219