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Cash flow information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Interest, net | [1] | $ 79,638,000 | $ 87,920,000 | $ 88,775,000
Income taxes paid, net | [2] | 112,137,000 | 105,908,000 | 61,405,000
Capitalized interest and AFUDC borrowed |  | 966,000 | 914,000 | 9,300,000
Property, plant and equipment additions in accounts payable |  | 29,263,000 | 22,712,000 | 39,754,000
Continuing and discontinued operations [Member] |  |  |  |
Income taxes paid, net |  | $ 9,700,000 | $ 1,300,000 | $ 2,400,000
[1] | Capitalized interest and AFUDC - borrowed was $966,000, $914,000 and $9.3 million for the years ended December 31, 2017, 2016 and 2015, respectively.
[2] | Income taxes paid, net of discontinued operations, were $9.7 million, $1.3 million and $2.4 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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