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Other Financial Information (Tables) | 6 Months Ended
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Jun. 30, 2017
Other Financial Information [Abstract] |
Noncash Operating Working Capital (Increase) Decrease |
﻿ |  |  |  |  |
﻿ | Six Months Ended June 30, |
﻿(Thousands of dollars) | 2017 |  | 2016 |
﻿Net (increase) decrease in operating working capital other than cash and cash equivalents: |  |  |  |  |
﻿Decrease in accounts receivable | $ | 125,283 |  | 109,105 |
﻿Decrease (increase) in inventories |  | 5,918 |  | (4,659) |
﻿Decrease in prepaid expenses |  | 9,206 |  | 99,524 |
﻿Decrease in other |  | – |  | 5,564 |
﻿Decrease in accounts payable and accrued liabilities |  | (136,500) |  | (337,302) | *
﻿Increase in current income tax liabilities |  | 38,674 |  | 40,975 |
﻿Net (increase) decrease in noncash operating working capital | $ | 42,581 |  | (86,793) |
﻿Supplementary disclosures: |  |  |  |  |
﻿Cash income taxes paid, net of refunds | $ | 9,448 |  | (4,367) |
﻿Interest paid, net of amounts capitalized |  | 72,136 |  | 52,654 |
﻿ |  |  |  |  |
﻿Non-cash investing activities: |  |  |  |  |
﻿Asset retirement costs capitalized | $ | 797 |  | 8,693 |
﻿Decrease in capital expenditure accrual |  | 43,370 |  | 165,329 |
﻿ ﻿ * 2016 balances included payments for deepwater rig contract exit of $261.8 million.

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- Definition Tabular disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. + References No definition available. + Details
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