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Discontinued Operations and Assets Held for Sale (Major Categories of Assets and Liabilities Reflected as Held for Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Accounts receivable | $ 243,472 | $ 357,099
Total current assets held for sale | 22,929 | 27,070
Accounts payable | 595,916 | 784,975
Total current liabilities associated with assets held for sale | 3,530 | 2,776
Asset retirement obligation - Seal asset | 709,299 | 681,528
UK Refining And Marketing Operations [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Cash | 16,631 | 4,126
Accounts receivable | 6,298 | 22,944
Total current assets held for sale | 22,929 | 27,070
Accounts payable | 837 | 270
Refinery decommissioning cost | 2,693 | 2,506
Total current liabilities associated with assets held for sale | $ 3,530 | 2,776
Asset retirement obligation - Seal asset |  | $ 85,900

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