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Reclassification out of accumulated other comprehensive income (loss) (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Revenues | $ 1,370,455 | $ 1,285,782 | $ 3,507,354 | $ 3,277,980
Interest expense | (22,425) | (21,012) | (64,912) | (63,312)
Other income | 2,644 | 2,326 | 7,552 | 5,003
Income before income taxes | 156,887 | 131,126 | 320,900 | 287,093
Income taxes | 54,769 | 46,576 | 109,818 | 99,559
Loss from equity method investments | (97) | (61) | (343) | (380)
Net income (loss) | 102,121 | 84,432 | 211,588 | 187,280
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 | (132) | 807 | (703) | 5,924
Income taxes | 50 | (297) | 264 | (2,246)
Net income (loss) | (82) | 510 | (439) | 3,678
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 | (420) | (437) | (1,258) | (2,371)
Income taxes | 159 | 166 | 477 | 1,027
Net income (loss) | (261) | (271) | (781) | (1,344)
Reclassification adjustment for loss on foreign currency translation adjustment included in net income |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Loss from equity method investments | 0 | (185) | 0 | (213)
Earnings from equity method investments, tax | 0 | 70 | 0 | 70
Net income (loss) | 0 | (115) | 0 | (143)
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 | (47) | (58) | (154) | (180)
Income taxes | 16 | 20 | 54 | 63
Net income (loss) | (31) | (38) | (100) | (117)
Total reclassifications |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income [Line Items] |  |  |  |
Net income (loss) | (374) | 86 | (1,320) | 2,074
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 | 28 | 1,007 | (223) | 6,903
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 | $ (160) | $ (200) | $ (480) | $ (979)

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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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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 FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: 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 This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + 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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