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Employee Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension and SERPA Benefits:        
Defined Benefit Plan Disclosure        
Service cost $ 1,175 $ 1,294 $ 3,525 $ 3,882
Interest cost 20,118 20,476 60,355 61,429
Expected return on plan assets (33,143) (36,519) (99,429) (109,557)
Amortization of unrecognized: Prior service cost (credit) 188 188 564 564
Amortization of unrecognized: Net (gain) loss (163) (181) (489) (543)
Settlement gain 0 0 0 (222)
Special retirement benefit cost 0 0 1,722 0
Net periodic benefit income (11,825) (14,742) (33,752) (44,447)
Postretirement Healthcare Benefits:        
Defined Benefit Plan Disclosure        
Service cost 723 797 2,169 2,390
Interest cost 2,694 2,772 8,082 8,316
Expected return on plan assets (4,424) (4,281) (13,272) (12,843)
Amortization of unrecognized: Prior service cost (credit) 149 (166) 447 (498)
Amortization of unrecognized: Net (gain) loss (1,250) (1,097) (3,750) (3,291)
Net periodic benefit income $ (2,108) $ (1,975) $ (6,324) $ (5,926)