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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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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Amount of contractual obligation due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of contractual obligation due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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