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Discontinued Operations (Major Categories of Assets and Liabilities Reflected as Held for Sale) (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 232,558 | $ 357,099
Total current assets held for sale | 22,245 | 27,070
Accounts payable | 595,775 | 784,975
Total current liabilities associated with assets held for sale | 2,952 | 2,776
UK Refining And Marketing Operations [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Cash | 13,050 | 4,126
Accounts receivable | 9,195 | 22,944
Total current assets held for sale | 22,245 | 27,070
Accounts payable | 508 | 270
Refinery decommissioning cost | 2,444 | 2,506
Total current liabilities associated with assets held for sale | $ 2,952 | $ 2,776

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