| Schedule of Changes in Current Assets and Liabilities [Text Block] |
Changes in current assets and current liabilities were as follows: | | | | | | | | | | | | | | Year Ended December 31, | | 2011 | | 2010 | | 2009 | | (Thousands of Dollars) | Decrease (increase) in current assets: | | | | | | Accounts receivable | $ | (230,980 | ) | | $ | (90,369 | ) | | $ | (31,505 | ) | Inventories | (160,139 | ) | | (26,595 | ) | | (157,439 | ) | Income tax receivable | (4,265 | ) | | — |
| | — |
| Other current assets | (1,825 | ) | | 31,373 |
| | (38,195 | ) | Increase (decrease) in current liabilities: | | | | | | Accounts payable | 140,898 |
| | 80,980 |
| | 59,284 |
| Payable to related party | (3,603 | ) | | (218 | ) | | 7,051 |
| Accrued interest payable | 126 |
| | 8,179 |
| | (969 | ) | Accrued liabilities | (10,087 | ) | | (6,488 | ) | | 26,874 |
| Taxes other than income tax | 2,574 |
| | (4,793 | ) | | 209 |
| Income tax payable | 1,848 |
| | 1,064 |
| | (8,208 | ) | Changes in current assets and current liabilities | $ | (265,453 | ) | | $ | (6,867 | ) | | $ | (142,898 | ) |
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| Schedule of Supplemental Cash Flow Information [Text Block] |
Cash flows related to interest and income taxes were as follows: | | | | | | | | | | | | | | Year Ended December 31, | | 2011 | | 2010 | | 2009 | | (Thousands of Dollars) | Cash paid for interest, net of amount capitalized | $ | 109,027 |
| | $ | 87,653 |
| | $ | 93,632 |
| Cash paid for income taxes, net of tax refunds received | $ | 14,920 |
| | $ | 13,062 |
| | $ | 20,150 |
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