v3.26.3
Pension Plan and Other Postretirement Benefits - Schedule of Components of Net Periodic Benefit Costs for the Pension Plans and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension Plan        
Pension Plan and Other Postretirement Benefits        
Service cost $ 5,783 $ 5,206 $ 17,347 $ 15,620
Interest cost 10,232 9,552 30,695 28,658
Expected return on plan assets (14,276) (12,792) (42,827) (38,378)
Amortization of prior service cost 132 132 394 394
Recognized net actuarial loss (gain) 605 195 1,817 583
Net periodic benefit cost (credit) 2,476 2,293 7,426 6,877
Other Benefits        
Pension Plan and Other Postretirement Benefits        
Service cost 1,330 1,407 3,991 4,223
Interest cost 1,642 1,774 4,925 5,320
Expected return on plan assets (3,679) (3,197) (11,038) (9,591)
Amortization of prior service cost 38 38 116 116
Recognized net actuarial loss (gain) (962) (522) (2,887) (1,566)
Net periodic benefit cost (credit) $ (1,631) $ (500) $ (4,893) $ (1,498)