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Cash flow information (Details 1) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Supplemental Cash Flow Information [Abstract] |  |
Interest, net of amounts capitalized and AFUDC - borrowed of $7.5 million and $8.6 million in 2015 and 2014, respectively | $ 70,203 | $ 61,610
Income taxes paid, net | 20,652 | 58,345
Property, plant and equipment additions in accounts payable | $ 15,499 | $ 49,260

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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