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Asset Under Development (Commitments) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Apr. 30, 2019
--- | --- | ---
Extractive Industries [Abstract] |  |
2019 | $ 235,923 |
2020 | 364,748 |
2021 | 213,203 |
2022 | 230,724 |
2023 | 134,231 |
Total | $ 1,178,829 | $ 1,300,000

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