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Reclassification out of accumulated other comprehensive loss (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]            
Interest expense $ (26,459)   $ (19,187)   $ (50,412) $ (38,079)
Income taxes (57,918)   (5,347)   (78,986) (24,140)
Other income 9,959   (2,209)   20,333 (3,253)
Net income 130,692 $ 38,353 70,667 $ 31,763 169,044 102,430
Reclassification out of accumulated other comprehensive loss            
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]            
Net income (447)   (597)   (594) (1,186)
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 (53)   (147)   (98) (295)
Income taxes 6   36   17 72
Net income (47)   (111)   (81) (223)
Amortization of postretirement liability losses included in net periodic benefit credit | Reclassification out of accumulated other comprehensive loss            
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]            
Income taxes 131   148   165 312
Other income (518)   (609)   (652) (1,218)
Net income (387)   (461)   (487) (906)
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 3   7   6 15
Other income (16)   (32)   (32) (72)
Net income $ (13)   $ (25)   $ (26) $ (57)