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Cash flow information (Details 1) - USD ($) | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Supplemental Cash Flow Information [Abstract] |  |
Interest, net of amounts capitalized and AFUDC - borrowed of $260,000 and $2.6 million in 2016 and 2015, respectively | $ 23,830,000 | $ 23,852,000
Capitalized interest and AFUDC borrowed | 260,000 | 2,600,000
Income taxes refunded | (1,429,000) | (11,216,000)
Property, plant and equipment additions in accounts payable | $ 30,232,000 | $ 29,575,000

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