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Supplemental Cash Flow Information (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Aug. 07, 2018 | Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract] |  |  |  |
Payments of interest and commitment fees | $ 158,200 | $ 126,900 |  |
Interest paid, capitalized | 2,700 | 13,800 |  |
Incurred liabilities for fixed and intangible asset additions | 16,600 | $ 25,700 |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [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 |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Option payment on assets held for sale |  |  | $ 30,000 |
Current assets held for sale | $ 255,500 |  |  |

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