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Other Financial Information | 9 Months Ended
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Sep. 30, 2017
Other Financial Information [Abstract] |
Other Financial Information | Note E – Other Financial Information ﻿ Additional disclosures regarding cash flow activities are provided below. ﻿
﻿ |  |  |  |  |
﻿ | Nine Months Ended September 30, |
﻿(Thousands of dollars) | 2017 |  | 2016 |
﻿Net (increase) decrease in operating working capital other than cash and cash equivalents: |  |  |  |  |
﻿Decrease in accounts receivable | $ | 90,614 |  | 75,841 |
﻿Decrease (increase) in inventories |  | 5,869 |  | (15,768) |
﻿Decrease in prepaid expenses |  | 25,285 |  | 122,399 |
﻿Decrease in other |  | – |  | 720 |
﻿Decrease in accounts payable and accrued liabilities |  | (115,977) |  | (376,310) | *
﻿(Decrease) increase in current income tax liabilities |  | (4,721) |  | 40,500 |
﻿Net (increase) decrease in noncash operating working capital | $ | 1,070 |  | (152,618) |
﻿Supplementary disclosures: |  |  |  |  |
﻿Cash income taxes paid, net of refunds | $ | 25,118 |  | (3,911) |
﻿Interest paid, net of amounts capitalized of $3,338 in 2017 and $3,318 in 2016 |  | 95,899 |  | 52,287 |
﻿ |  |  |  |  |
﻿Non-cash investing activities: |  |  |  |  |
﻿Asset retirement costs capitalized | $ | 38,992 |  | 13,959 |
﻿Decrease in capital expenditure accrual |  | 42,403 |  | 179,203 |
﻿ ﻿ *2016 balance included payments for deepwater rig contract exit of $266.6 million.

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