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Reclassification out of accumulated other comprehensive loss (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]            
Interest expense $ (23,381)   $ (24,818)   $ (46,835) $ (49,371)
Income taxes (23,164)   (23,657)   (36,112) (29,631)
Other income 9,027   10,063   12,381 9,058
Net Income 100,190 $ 52,131 99,703 $ 25,130 152,321 124,833
Reclassification out of accumulated other comprehensive loss            
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]            
Net Income (594)   (599)   (1,206) (1,171)
Reclassification adjustment for loss on derivative instruments included in net income | Reclassification out of accumulated other comprehensive loss | Interest rate contract            
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]            
Interest expense (148)   (148)   (296) (295)
Income taxes 36   36   73 72
Net Income (112)   (112)   (223) (223)
Amortization of postretirement liability losses included in net periodic benefit cost | Reclassification out of accumulated other comprehensive loss            
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]            
Income taxes 160   155   311 304
Other income (617)   (635)   (1,234) (1,246)
Net Income (457)   (480)   (923) (942)
Reclassification adjustment on available-for-sale investments included in net income | Reclassification out of accumulated other comprehensive loss            
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]            
Income taxes 6   2   15 2
Other income (31)   (9)   (75) (8)
Net Income $ (25)   $ (7)   $ (60) $ (6)