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Cash flow information (Details 13) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Accounting Policies [Abstract] |  |  |
Interest, net of amount capitalized and AFUDC - borrowed of $9,809, $11,608 and $8,800 in 2015, 2014 and 2013, respectively | $ 90,386 | $ 81,241 | $ 81,575
Income taxes paid, net | 33,409 | 64,211 | 52,580
Capital expenditures incurred but not yet paid | 51,702 | 62,453 | 22,832
Capitalized interest and AFUDC borrowed | $ 9,809 | $ 11,608 | $ 8,800

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