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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 | Mar. 31, 2018 | Dec. 31, 2017
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Accounts receivable | $ 212,639 | $ 243,472
Total current assets held for sale | 22,696 | 22,929
Accounts payable | 615,963 | 595,916
Total current liabilities associated with assets held for sale | 3,160 | 3,530
UK Refining And Marketing Operations [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Cash | 16,380 | 16,631
Accounts receivable | 6,316 | 6,298
Total current assets held for sale | 22,696 | 22,929
Accounts payable | 467 | 837
Refinery decommissioning cost | 2,693 | 2,693
Total current liabilities associated with assets held for sale | $ 3,160 | $ 3,530

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