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Reclassification out of accumulated other comprehensive loss (Details 2) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]    
Interest expense $ (38,020) $ (25,260)
Income taxes (8,977) (7,950)
Other income 10,868 (2,400)
Net income 38,353 31,763
Reclassification out of accumulated other comprehensive loss    
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]    
Net income (147) (589)
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 (45) (148)
Income taxes 11 36
Net income (34) (112)
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 34 164
Other income (134) (609)
Net income (100) (445)
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 8
Other income (16) (40)
Net income $ (13) $ (32)