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Discontinued Operations and Assets Held for Sale (Tables) | 12 Months Ended
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Dec. 31, 2018
Discontinued Operations and Assets Held for Sale [Abstract] |
Major Categories of Assets and Liabilities Reflected as Held for Sale |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿(Thousands of dollars) |  | 2018 |  |  | 2017
﻿Current assets |  |  |  |  |  |
﻿ Cash |  | $ | 17,219 |  |  | 16,631
﻿ Accounts receivable |  |  | 3,728 |  |  | 6,298
﻿ Total current assets held for sale |  | $ | 20,947 |  |  | 22,929
﻿Current liabilities |  |  |  |  |  |
﻿ Accounts payable |  | $ | 106 |  |  | 837
﻿ Refinery decommissioning cost |  |  | 2,658 |  |  | 2,693
﻿ Total current liabilities associated with assets held for sale |  | $ | 2,764 |  |  | 3,530
﻿
Results of Operations Associated with Discontinued Operations |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿(Thousands of dollars) | 2018 |  | 2017 |  | 2016
﻿Revenues | $ | 6 |  | 854 |  | 1,464
﻿Loss from operations before income taxes | $ | (3,522) |  | (853) |  | (2,027)
﻿Loss on sale before income taxes |  | – |  | – |  | –
﻿Total loss from discontinued operations before taxes |  | (3,522) |  | (853) |  | (2,027)
﻿Income tax expense |  | – |  | – |  | –
﻿Loss from discontinued operations | $ | (3,522) |  | (853) |  | (2,027)
﻿

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