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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Significant Accounting Policies |
Schedule of changes in the asset retirement obligation |
|  | Years ended December 31, |
(Thousands of dollars) |  | 2012 |  | 2011 |
Beginning balance |  | $ 13,109 |  | $ 12,028 |
Accretion expense |  | 1,090 |  | 1,007 |
Liability for additional lagoons placed in service |  | 116 |  | 74 |
Ending balance |  | $ 14,315 |  | $ 13,109 |
Schedule of amounts paid for interest and income taxes |
|  | Years ended December 31, |
(Thousands of dollars) |  | 2012 |  | 2011 |  | 2010 |
Interest (net of amounts capitalized) |  | $ | 11,674 |  | $ | 6,786 |  | $ | 8,377 |
Income taxes (net of refunds) |  | 69,760 |  | 126,730 |  | 69,626 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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