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Cash flow information (Details 1) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Supplemental Cash Flow Information [Abstract]    
Interest, net of amounts capitalized and AFUDC - borrowed of $842 and $6,989 in 2016 and 2015, respectively $ 66,281 $ 69,253
Capitalized interest and AFUDC borrowed 842 6,989
Income taxes paid, net 73,771 39,543
Property, plant and equipment additions in accounts payable $ 22,560 $ 15,348