Commitments and Contingencies - Minimum Annual Payments for Non-Cancelable Ship Construction Contracts (Details) - Ship Construction Contracts $ in Thousands |
Dec. 31, 2019
USD ($)
|
|---|---|
| Other Commitments [Line Items] | |
| 2020 | $ 556,784 |
| 2021 | 279,254 |
| 2022 | 1,595,262 |
| 2023 | 1,439,097 |
| 2024 | 888,790 |
| Thereafter | 829,303 |
| Total minimum annual payments | $ 5,588,490 |