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Pension and Postretirement Plans (Total Benefit/Cost) (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Cost (Benefit)     $ (61,090) $ (64,532)
Defined Benefit Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 11,772 $ 14,761 35,663 42,866
Interest cost 8,012 11,220 21,389 33,660
Expected return on assets (41,915) (41,487) (125,767) (124,416)
Amortization of prior service credit (520) (487) (1,560) (1,463)
Recognized actuarial gain 0 (11,891) 0 (35,672)
Net Periodic Cost (Benefit) (22,651) (27,884) (70,275) (85,025)
Special separation benefit expense 2,546 3,665 9,185 20,493
Net Periodic Cost (Benefit) (20,105) (24,219) (61,090) (64,532)
Supplemental Executive Retirement Plan (SERP) [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 239 287 716 862
Interest cost 1,198 1,128 3,592 3,385
Net Periodic Cost (Benefit) 1,437 1,415 4,308 4,247
Other Postretirement Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 10 14 32 42
Recognized actuarial gain (378) (469) (1,137) (1,408)
Net Periodic Cost (Benefit) $ (368) $ (455) $ (1,105) $ (1,366)