v3.10.0.1

STATEMENTS OF CASH FLOWS (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2018
Statement of Cash Flows [Abstract] |
Schedule of Changes in Current Assets and Liabilities [Text Block] | Changes in current assets and current liabilities were as follows:
| Nine Months Ended September 30,
| 2018 |  | 2017
| (Thousands of Dollars)
Decrease (increase) in current assets: |  |  |
Accounts receivable | $ | 11,530 |  |  | $ | 24,538 |
Receivable from related party | 160 |  |  | 236 |
Inventories | 2,079 |  |  | 15,497 |
Other current assets | (953 | ) |  | 1,176 |
Increase (decrease) in current liabilities: |  |  |
Accounts payable | 18,082 |  |  | (52,910 | )
Accrued interest payable | (9,700 | ) |  | 7,829 |
Accrued liabilities | 4,830 |  |  | (10,702 | )
Taxes other than income tax | 4,809 |  |  | 279 |
Income tax payable | 406 |  |  | (3,614 | )
Changes in current assets and current liabilities | $ | 31,243 |  |  | $ | (17,671 | )
Schedule of Supplemental Cash Flow Information [Text Block] | Cash flows related to interest and income taxes were as follows:
| Nine Months Ended September 30,
| 2018 |  | 2017
| (Thousands of Dollars)
Cash paid for interest, net of amount capitalized | $ | 145,089 |  |  | $ | 112,335 |
Cash paid for income taxes, net of tax refunds received | $ | 8,490 |  |  | $ | 10,090 |

X
- 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
Name: | us-gaap_CashFlowOperatingCapitalTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration