| Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Text Block] |
The fair values of our derivative instruments included in our consolidated balance sheets were as follows: | | | | | | | | | | | | | | | | | | | | | | Asset Derivatives | | Liability Derivatives | | Balance Sheet Location | | December 31, | | December 31, | | | 2011 | | 2010 | | 2011 | | 2010 | | | | (Thousands of Dollars) | Derivatives Designated as Hedging Instruments: | | | | | | | | | | Commodity contracts | Other current assets | | $ | 36,116 |
| | $ | — |
| | $ | (33,616 | ) | | $ | — |
| Commodity contracts | Other long-term assets, net | | 86,052 |
| | — |
| | (66,175 | ) | | — |
| Interest rate swaps | Other long-term assets, net | | 2,335 |
| | 45,663 |
| | — |
| | — |
| Commodity contracts | Accrued liabilities | | — |
| | 2,176 |
| | — |
| | (2,522 | ) | Interest rate swaps | Accrued liabilities | | — |
| | — |
| | (22,009 | ) | | — |
| Interest rate swaps | Other long-term liabilities | | — |
| | — |
| | (27,190 | ) | | (29,483 | ) | Total | | | 124,503 |
| | 47,839 |
| | (148,990 | ) | | (32,005 | ) | | | | | | | | | | | Derivatives Not Designated as Hedging Instruments: | | | | | | | | | | Commodity contracts | Other current assets | | 15,568 |
| | — |
| | (5,956 | ) | | — |
| Commodity contracts | Other long-term assets, net | | 7,207 |
| | — |
| | — |
| | — |
| Commodity contracts | Accrued liabilities | | 519 |
| | 46,632 |
| | (5,943 | ) | | (61,027 | ) | Total | | | 23,294 |
| | 46,632 |
| | (11,899 | ) | | (61,027 | ) | | | | | | | | | | | Total Derivatives | | | $ | 147,797 |
| | $ | 94,471 |
| | $ | (160,889 | ) | | $ | (93,032 | ) |
|
| Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block] |
The earnings impact of our derivative activity was as follows: | | | | | | | | | | | | | | | | Derivatives Designated as Fair Value Hedging Instruments | | Income Statement Location | | Amount of Gain (Loss) Recognized in Income on Derivative (Effective Portion) | | Amount of Gain (Loss) Recognized in Income on Hedged Item | | Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion) | | | | | (Thousands of Dollars) | Year ended December 31, 2011: | | | | | | | Interest rate swaps | | Interest expense, net | | $ | (55,183 | ) | | $ | 54,588 |
| | $ | (595 | ) | Commodity contracts | | Cost of product sales | | (10,228 | ) | | 9,004 |
| | (1,224 | ) | Total | | | | $ | (65,411 | ) | | $ | 63,592 |
| | $ | (1,819 | ) | | | | | | | | | | Year ended December 31, 2010: | | | | | | | Interest rate swaps | | Interest expense, net | | $ | (27,443 | ) | | $ | 27,443 |
| | $ | — |
| Commodity contracts | | Cost of product sales | | (3,221 | ) | | 13,946 |
| | 10,725 |
| Total | | | | $ | (30,664 | ) | | $ | 41,389 |
| | $ | 10,725 |
| | | | | | | | | | Year ended December 31, 2009: | | | | | | | Interest rate swaps | | Interest expense, net | | $ | (6,661 | ) | | $ | 6,661 |
| | $ | — |
| Commodity contracts | | Cost of product sales | | (22,939 | ) | | 35,512 |
| | 12,573 |
| Total | | | | $ | (29,600 | ) | | $ | 42,173 |
| | $ | 12,573 |
|
| | | | | | | | | | | | | | | | Derivatives Designated as Cash Flow Hedging Instruments | | Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | | Income Statement Location (a) | | Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | | Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion) | | | (Thousands of Dollars) | | | | (Thousands of Dollars) | Year ended December 31, 2011: | | | | | | | Interest rate swaps | | $ | (84,199 | ) | | Interest expense, net | | $ | — |
| | $ | — |
| Commodity contracts | | 30,747 |
| | Cost of product sales | | 5,030 |
| | (4,010 | ) | Total | | $ | (53,452 | ) | | | | $ | 5,030 |
| | $ | (4,010 | ) | | | | | | | | | | Year ended December 31, 2010: | | | | | | | Interest rate swaps | | $ | 35,000 |
| | Interest expense, net | | $ | — |
| | $ | — |
| Commodity contracts | | (1,440 | ) | | Cost of product sales | | (1,680 | ) | | — |
| Total | | $ | 33,560 |
| | | | $ | (1,680 | ) | | $ | — |
| | | | | | | | | | Year ended December 31, 2009: | | | | | | | Commodity contracts | | $ | (240 | ) | | Cost of product sales | | $ | — |
| | $ | — |
|
| | (a) | Amounts are included in specified location for both the gain (loss) reclassified from accumulated OCI into income (effective portion) and the gain (loss) recognized in income on derivative (ineffective portion). |
| | | | | | | | Derivatives Not Designated as Hedging Instruments | | Income Statement Location | | Amount of Gain (Loss) Recognized in Income | | | | | (Thousands of Dollars) | Year ended December 31, 2011: | | | | | Commodity contracts | | Revenues | | $ | 235 |
| Commodity contracts | | Cost of product sales | | (4,454 | ) | Commodity contracts | | Operating expenses | | 46 |
| Total | | | | $ | (4,173 | ) | | | | | | Year ended December 31, 2010: | | | | | Commodity contracts | | Cost of product sales | | $ | (3,050 | ) | Commodity contracts | | Operating expenses | | (52 | ) | Total | | | | $ | (3,102 | ) | | | | | | Year ended December 31, 2009: | | | | | Commodity contracts | | Cost of product sales | | $ | (13,594 | ) | Commodity contracts | | Operating expenses | | (3,589 | ) | Total | | | | $ | (17,183 | ) |
|