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Asset Under Development (Commitments) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Apr. 30, 2019
--- | --- | ---
Extractive Industries [Abstract] |  |
2019 | $ 206,076 |
2020 | 365,224 |
2021 | 215,782 |
2022 | 218,357 |
2023 | 136,761 |
Total | $ 1,142,200 | $ 1,300,000

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