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Pension Plans and Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 3,300 $ 1,900 $ 5,000 $ 4,000
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 2,897 1,768 4,580 3,765
Interest cost 13,782 11,133 25,235 22,763
Expected return on plan assets (16,987) (14,654) (30,991) (30,153)
Amortization of prior service cost 792 820 1,583 1,640
Net periodic benefit (income) / loss 484 (933) 407 (1,985)
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 384 96 469 193
Interest cost 869 503 1,401 1,008
Expected return on plan assets (487) (487) (973) (974)
Amortization of prior service cost 22 12 44 23
Net periodic benefit (income) / loss $ 788 $ 124 $ 941 $ 250