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Other Financial Information | 3 Months Ended
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Mar. 31, 2018
Other Financial Information [Abstract] |
Other Financial Information | ﻿ Note G – Other Financial Information Additional disclosures regarding cash flow activities are provided below. ﻿
﻿ |  |  |  |  |
﻿ | Three Months Ended March 31, |
﻿(Thousands of dollars) | 2018 |  | 2017 |
﻿Net (increase) decrease in operating working capital other than cash and cash equivalents: |  |  |  |  |
﻿Decrease in accounts receivable | $ | 30,467 |  | 36,246 |
﻿Decrease in inventories |  | 12,189 |  | 4,497 |
﻿Decrease (increase) in prepaid expenses |  | (5,031) |  | 17,788 |
﻿Decrease in accounts payable and accrued liabilities |  | (25,270) |  | (44,240) |
﻿Increase in income taxes payable |  | 29,199 |  | 29,127 |
﻿Net decrease in noncash operating working capital | $ | 41,554 |  | 43,418 |
﻿Supplementary disclosures: |  |  |  |  |
﻿Cash income taxes paid, net of refunds | $ | 7,940 |  | 3,422 |
﻿Interest paid, net of amounts capitalized of $1,139 in 2018 and $1,093 in 2017 |  | 35,666 |  | 17,720 |
﻿ |  |  |  |  |
﻿Non-cash investing activities: |  |  |  |  |
﻿Asset retirement costs capitalized | $ | 727 |  | 565 |
﻿Decrease (increase) in capital expenditure accrual |  | (10,757) |  | 12,906 |
﻿ ﻿

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- Definition The entire disclosures of supplemental information, including descriptions and amounts, related to the balance sheet, income statement, and/or cash flow statement. + References No definition available. + Details
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