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Reclassification out of accumulated other comprehensive income (loss) (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Reclassification adjustment out of accumulated other comprehensive income [Line Items]            
Interest expense $ (25,429)   $ (20,800)   $ (48,836) $ (41,246)
Income taxes (10,352)   (10,716)   (17,668) (18,267)
Other income 1,615   1,599   9,208 2,181
Net Income 61,825 $ 40,926 43,802 $ 42,437 102,751 86,239
Reclassification out of accumulated other comprehensive income            
Reclassification adjustment out of accumulated other comprehensive income [Line Items]            
Net Income (399)   (827)   (1,134) (1,367)
Reclassification adjustment for loss on derivative instruments included in net income | Reclassification out of accumulated other comprehensive income | Interest rate contract            
Reclassification adjustment out of accumulated other comprehensive income [Line Items]            
Interest expense (147)   (148)   (295) (296)
Income taxes 36   53   (213) 109
Net Income (111)   (95)   (508) (187)
Amortization of postretirement liability losses included in net periodic benefit cost (credit) | Reclassification out of accumulated other comprehensive income            
Reclassification adjustment out of accumulated other comprehensive income [Line Items]            
Income taxes 89   145   189 300
Other income (365)   (594)   (775) (1,167)
Net Income (276)   (449)   (586) (867)
Reclassification adjustment for loss on foreign currency translation adjustment included in net income | Reclassification out of accumulated other comprehensive income            
Reclassification adjustment out of accumulated other comprehensive income [Line Items]            
Income taxes 0   75   0 75
Other income 0   (324)   0 (324)
Net Income 0   (249)   0 (249)
Reclassification adjustment on available-for-sale investments included in net income | Reclassification out of accumulated other comprehensive income            
Reclassification adjustment out of accumulated other comprehensive income [Line Items]            
Income taxes 3   10   10 17
Other income (15)   (44)   (50) (81)
Net Income $ (12)   $ (34)   $ (40) $ (64)