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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)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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