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Reclassification out of accumulated other comprehensive income (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Revenues | $ 1,060,595 | $ 967,962 | $ 1,992,198 | $ 1,820,769
Interest expense | 21,427 | 17,650 | 42,300 | 37,089
Income before income taxes | 71,380 | 75,698 | 155,967 | 129,667
Income taxes | 24,988 | 26,691 | 52,983 | 44,769
Net income (loss) | 46,333 | 54,113 | 102,848 | 89,904
Reclassification adjustment for gain (loss) on derivative instruments included in net income |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Income before income taxes | 718 |  | 5,116 |
Income taxes | (322) |  | (1,948) |
Net income (loss) | 396 |  | 3,168 |
Amortization of postretirement liability losses included in net periodic benefit cost |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Net periodic benefit cost | (967) |  | (1,934) |
Income taxes | 543 |  | 862 |
Net income (loss) | (424) |  | (1,072) |
Reclassification adjustment for loss on available-for-sale investments included in net income |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Other income | (67) |  | (121) |
Income taxes | 23 |  | 42 |
Net income (loss) | (44) |  | (79) |
Total reclassifications |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Net income (loss) | (72) |  | 2,017 |
Commodity derivative instruments [Member] | Reclassification adjustment for gain (loss) on derivative instruments included in net income |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Revenues | 1,382 |  | 5,896 |
Interest rate derivative instruments [Member] | Reclassification adjustment for gain (loss) on derivative instruments included in net income |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Interest expense | $ (664) |  | $ (780) |

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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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