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Pensions and other postretirement benefit plans - Schedule of Pension Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Non-operating expenses:      
Total non-operating (benefit) expense $ (12,438) $ (9,382) $ (58,953)
Total (benefit) expense for retirement plans (11,400) (8,000) (57,100)
Other changes in plan assets and benefit obligations recognized in Other comprehensive income (loss):      
Net actuarial (gain) loss (10,205) (33,135) 185,282
Amortization of net actuarial (loss) gain (1,014) 305 500
Change in prior service cost 0 (3,307) 0
Amortization of prior service costs 500 502 (66)
(Gain) loss recognized in Other comprehensive income (loss) (12,275) (28,830) 180,433
Pension benefits      
Operating expenses:      
Service cost - benefits earned during the period 998 1,366 1,754
Non-operating expenses:      
Interest cost on benefit obligations 81,500 84,449 71,733
Expected return on plan assets (96,726) (95,358) (131,295)
Amortization of actuarial loss (gain) 2,926 2,185 89
Amortization of prior service costs 69 67 66
Settlement loss (gain) 35 0 (727)
Curtailment 119 0 0
Total non-operating (benefit) expense (12,077) (8,657) (60,134)
Total (benefit) expense for retirement plans (11,079) (7,291) (58,380)
Other changes in plan assets and benefit obligations recognized in Other comprehensive income (loss):      
Net actuarial (gain) loss (9,919) (33,244) 199,374
Amortization of net actuarial (loss) gain (2,926) (2,185) (89)
Change in prior service cost 0 0 0
Amortization of prior service costs (69) (67) (66)
Settlement (loss) gain (35) 0 0
Equity method investments (116) (610) 0
Other (1,405) 7,415 (5,283)
(Gain) loss recognized in Other comprehensive income (loss) (14,470) (28,691) 193,936
Postretirement benefits      
Operating expenses:      
Service cost - benefits earned during the period 35 40 77
Non-operating expenses:      
Interest cost on benefit obligations 2,120 2,334 1,770
Expected return on plan assets 0 0 0
Amortization of actuarial loss (gain) (1,912) (2,490) (589)
Amortization of prior service costs (569) (569) 0
Settlement loss (gain) 0 0 0
Curtailment 0 0 0
Total non-operating (benefit) expense (361) (725) 1,181
Total (benefit) expense for retirement plans (326) (685) 1,258
Other changes in plan assets and benefit obligations recognized in Other comprehensive income (loss):      
Net actuarial (gain) loss (286) 109 (14,092)
Amortization of net actuarial (loss) gain 1,912 2,490 589
Change in prior service cost 0 (3,307) 0
Amortization of prior service costs 569 569 0
Settlement (loss) gain 0 0 0
Equity method investments 0 0 0
Other 0 0 0
(Gain) loss recognized in Other comprehensive income (loss) $ 2,195 $ (139) $ (13,503)