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Employee Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension and SERPA Benefits:        
Defined Benefit Plan Disclosure        
Service cost $ 1,175 $ 1,294 $ 2,350 $ 2,588
Interest cost 20,118 20,476 40,237 40,952
Expected return on plan assets (33,143) (36,519) (66,286) (73,038)
Amortization of unrecognized: Prior service cost (credit) 188 188 376 376
Amortization of unrecognized: Net (gain) loss (163) (181) (326) (362)
Settlement gain 0 0 0 (222)
Special retirement benefit cost 1,722 0 1,722 0
Net periodic benefit income (10,103) (14,742) (21,927) (29,706)
Postretirement Healthcare Benefits:        
Defined Benefit Plan Disclosure        
Service cost 723 797 1,446 1,594
Interest cost 2,694 2,772 5,388 5,544
Expected return on plan assets (4,424) (4,281) (8,848) (8,562)
Amortization of unrecognized: Prior service cost (credit) 149 (166) 298 (332)
Amortization of unrecognized: Net (gain) loss (1,250) (1,097) (2,500) (2,194)
Net periodic benefit income $ (2,108) $ (1,975) $ (4,216) $ (3,950)