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Cash flow information (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Interest, net | $ 58,359,000 | $ 58,119,000 |
Income taxes paid, net | 8,887,000 | 46,430,000 |
AFUDC borrowed | 1,800,000 | 676,000 |
Property, plant and equipment additions in accounts payable | 34,594,000 | 16,914,000 | $ 29,263,000
Issuance of common stock in connection with acquisition | 17,993,000 | 0 | $ 0
Continuing and discontinued operations |  |  |
Income taxes paid, net | $ 5,100,000 | $ 1,400,000 |

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