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Pension and Postretirement Plans (Tables)
 9 Months Ended
Sep. 30, 2025
Defined Benefit Pension Plan [Member]  
Schedule of Net Benefit Costs The total benefit arising from the Company’s defined benefit pension plans consists of the following components:
  Three Months Ended 
 September 30		Nine Months Ended 
 September 30
(in thousands)2025202420252024
Service cost$11,772 $14,761 $35,663 $42,866 
Interest cost8,012 11,220 21,389 33,660 
Expected return on assets(41,915)(41,487)(125,767)(124,416)
Amortization of prior service credit(520)(487)(1,560)(1,463)
Recognized actuarial gain— (11,891)— (35,672)
Net Periodic Benefit(22,651)(27,884)(70,275)(85,025)
Special separation benefit expense
2,546 3,665 9,185 20,493 
Total Benefit$(20,105)$(24,219)$(61,090)$(64,532)
Schedule of Allocation of Plan Assets The assets of the Company’s pension plans were allocated as follows:
  As of
  September 30,
2025		December 31,
2024
  
U.S. equities60 %64 %
Private investment funds18 %19 %
International equities17 %12 %
U.S. fixed income5 %5 %
  100 %100 %
Supplemental Executive Retirement Plan (SERP) [Member]  
Schedule of Net Benefit Costs
The total cost arising from the Company’s Supplemental Executive Retirement Plan (SERP) consists of the following components:
  Three Months Ended 
 September 30		Nine Months Ended 
 September 30
(in thousands)2025202420252024
Service cost$239 $287 $716 $862 
Interest cost1,198 1,128 3,592 3,385 
Net Periodic Cost$1,437 $1,415 $4,308 $4,247 
Other Postretirement Benefit Plan, Defined Benefit [Member]  
Schedule of Net Benefit Costs
Other Postretirement Plans. The total benefit arising from the Company’s other postretirement plans consists of the following components:
  Three Months Ended 
 September 30		Nine Months Ended 
 September 30
(in thousands)2025202420252024
Interest cost$10 $14 $32 $42 
Recognized actuarial gain(378)(469)(1,137)(1,408)
Net Periodic Benefit$(368)$(455)$(1,105)$(1,366)