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Reclassification out of accumulated other comprehensive loss (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]                
Interest expense $ (23,389)     $ (23,761)     $ (70,224) $ (73,132)
Income taxes (32,748)     (31,547)     (68,860) (61,178)
Other income 5,930     4,612     18,310 13,669
Net income 139,276 $ 100,190 $ 52,131 153,078 $ 99,703 $ 25,130 291,597 277,911
Reclassification out of accumulated other comprehensive loss                
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]                
Net income (597)     (610)     (1,803) (1,781)
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 (147)     (148)     (443) (443)
Income taxes 36     37     109 109
Net income (111)     (111)     (334) (334)
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 151     152     462 456
Other income (617)     (623)     (1,851) (1,869)
Net income (466)     (471)     (1,389) (1,413)
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     7     21 9
Other income (26)     (35)     (101) (43)
Net income $ (20)     $ (28)     $ (80) $ (34)