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Cash flow information (Details 1) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Interest, net of amount capitalized and AFUDC - borrowed of $196 and $260 in 2017 and 2016, respectively |  | $ 17,546 | $ 23,109
Income taxes refunded, net | [1] | (2,762) | (1,429)
Property, plant and equipment additions in accounts payable |  | 5,212 | 23,277
Capitalized interest and AFUDC borrowed |  | 196 | 260
Continuing and discontinued operations [Member] |  |  |
Income taxes refunded, net |  | $ (7,200) | $ (1,400)
[1] | Income taxes refunded, net of discontinued operations, were $(7.2) million and $(1.4) million for the three months ended March 31, 2017 and 2016, respectively.

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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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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
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