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Cash flow information (Details 1) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Supplemental Cash Flow Information [Abstract] |  |
Interest, net of amounts capitalized and AFUDC - borrowed of $842 and $6,989 in 2016 and 2015, respectively | $ 66,281 | $ 69,253
Capitalized interest and AFUDC borrowed | 842 | 6,989
Income taxes paid, net | 73,771 | 39,543
Property, plant and equipment additions in accounts payable | $ 22,560 | $ 15,348

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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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