| 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, | | | 2013 | | 2012 | | 2013 | | 2012 | | | | (Thousands of Dollars) | Derivatives Designated as Hedging Instruments: | | | | | | | | | | Commodity contracts | Other current assets | | $ | — |
| | $ | 1,471 |
| | $ | — |
| | $ | (811 | ) | Commodity contracts | Accrued liabilities | | — |
| | — |
| | (130 | ) | | — |
| Interest rate swaps | Accrued liabilities | | — |
| | — |
| | — |
| | (40,911 | ) | Total | | | — |
| | 1,471 |
| | (130 | ) | | (41,722 | ) | | | | | | | | | | | Derivatives Not Designated as Hedging Instruments: | | | | | | | | | | Commodity contracts | Other current assets | | 16,168 |
| | 22,269 |
| | (11,220 | ) | | (13,571 | ) | Commodity contracts | Other long-term assets, net | | 15,883 |
| | 39,322 |
| | (8,906 | ) | | (30,116 | ) | Commodity contracts | Accrued liabilities | | 4,523 |
| | 17,406 |
| | (6,626 | ) | | (36,616 | ) | Commodity contracts | Other long-term liabilities | | 5,448 |
| | — |
| | (7,023 | ) | | — |
| Total | | | 42,022 |
| | 78,997 |
| | (33,775 | ) | | (80,303 | ) | | | | | | | | | | | Total Derivatives | | | $ | 42,022 |
| | $ | 80,468 |
| | $ | (33,905 | ) | | $ | (122,025 | ) |
|
| 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, 2013: | | | | | | | Commodity contracts | | Cost of product sales | | $ | 3,964 |
| | $ | (6,327 | ) | | $ | (2,363 | ) | | | | | | | | | | Year ended December 31, 2012: | | | | | | | Interest rate swaps | | Interest expense, net | | $ | 17,345 |
| | $ | (17,345 | ) | | $ | — |
| Commodity contracts | | Cost of product sales | | (10,505 | ) | | 12,139 |
| | 1,634 |
| Total | | | | $ | 6,840 |
| | $ | (5,206 | ) | | $ | 1,634 |
| | | | | | | | | | 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 | ) |
| | | | | | | | | | | | | | | | 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) (b) | | Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion) | | | (Thousands of Dollars) | | | | (Thousands of Dollars) | Year ended December 31, 2013: | | | | | | | Interest rate swaps | | $ | 7,213 |
| | Interest expense, net | | $ | (7,570 | ) | | $ | — |
| | | | | | | | | | Year ended December 31, 2012: | | | | | | | Interest rate swaps | | $ | (17,069 | ) | | Interest expense, net | | $ | (1,749 | ) | | $ | — |
| Commodity contracts | | (77,200 | ) | | (Loss) income from discontinued operations | | (51,483 | ) | | 4,010 |
| Total | | $ | (94,269 | ) | | | | $ | (53,232 | ) | | $ | 4,010 |
| | | | | | | | | | Year ended December 31, 2011: | | | | | | | Interest rate swaps | | $ | (84,199 | ) | | Interest expense, net | | $ | — |
| | $ | — |
| Commodity contracts | | 30,747 |
| | (Loss) income from discontinued operations | | 5,030 |
| | (4,010 | ) | Total | | $ | (53,452 | ) | | | | $ | 5,030 |
| | $ | (4,010 | ) |
| | (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, 2013: | | | | | Commodity contracts | | Cost of product sales | | $ | (5,323 | ) | Commodity contracts | | (Loss) income from discontinued operations | | (218 | ) | Total | | | | $ | (5,541 | ) | | | | | | Year ended December 31, 2012: | | | | | Commodity contracts | | Revenues | | $ | (7,654 | ) | Commodity contracts | | Cost of product sales | | 20,138 |
| Commodity contracts | | (Loss) income from discontinued operations | | 6,176 |
| Total | | | | $ | 18,660 |
| | | | | | Year ended December 31, 2011: | | | | | Commodity contracts | | Revenues | | $ | 235 |
| Commodity contracts | | Cost of product sales | | (11,661 | ) | Commodity contracts | | Operating expenses | | 46 |
| Commodity contracts | | (Loss) income from discontinued operations | | 7,207 |
| Total | | | | $ | (4,173 | ) |
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