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Cash flow information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Interest, net of amount capitalized and AFUDC - borrowed of $914, $9,288 and $10,069 in 2016, 2015 and 2014, respectively | $ 87,920 | $ 88,775 | $ 81,195
Income taxes paid, net | 105,908 | 61,405 | 80,090
Property, plant and equipment additions in accounts payable | 22,712 | 39,754 | 12,791
Capitalized interest and AFUDC borrowed | 914 | 9,288 | 10,069
Continuing and discontinued operations [Member] |  |  |
Income taxes paid, net | $ 1,300 | $ 2,400 | $ 69,800

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