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Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]          
Curtailment loss $ (1,400)        
Pension Benefits [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost   $ 4,030 $ 3,098 $ 11,739 $ 11,092
Interest cost   8,430 8,524 25,012 24,277
Expected return on plan assets   (11,356) (10,922) (33,940) (32,766)
Curtailment loss       169  
Amortization of prior service cost (credit)   126 123 375 369
Net loss recognition   684 1,184 2,043 3,208
Net periodic benefit cost   1,914 2,007 5,398 6,180
Other Postretirement Benefits [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost   719 559 2,000 1,909
Interest cost   1,706 1,872 5,178 4,825
Expected return on plan assets   (974) (891) (2,922) (2,673)
Amortization of prior service cost (credit)   (263) (263) (789) (789)
Net loss recognition   96 (54) 275 471
Net periodic benefit cost   $ 1,284 $ 1,223 $ 3,742 $ 3,743