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Subsequent Events (Details) - USD ($) $ in Thousands | Oct. 11, 2018 | Sep. 30, 2018 | Aug. 07, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Subsequent Event [Line Items] |  |  |  |
Current assets held for sale |  | $ 255,519 |  | $ 0
Non-Core Assets Powder River Basin [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Option payment on assets held for sale |  |  | $ 30,000 |
Current assets held for sale |  | 255,500 |  |
Accounts receivables of assets held for sale |  | 1,100 |  |
Current liabilities of assets held for sale |  | $ 2,700 |  |
Non-Core Assets Powder River Basin [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Option payment on assets held for sale |  |  | $ 30,000 |
Non-Core Assets Powder River Basin [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Net proceeds received on divestiture of assets held for sale | $ 300,000 |  |  |

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