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Pension and Postretirement Plans (Tables)
 3 Months Ended
Mar. 31, 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 
 March 31
(in thousands)20252024
Service cost$12,192 $14,034 
Interest cost6,421 11,194 
Expected return on assets(41,971)(41,690)
Amortization of prior service credit(519)(494)
Recognized actuarial gain— (12,518)
Net Periodic Benefit(23,877)(29,474)
Special separation benefit expense
624 418 
Total Benefit$(23,253)$(29,056)
Schedule of Allocation of Plan Assets The assets of the Company’s pension plans were allocated as follows:
  As of
  March 31,
2025		December 31,
2024
  
U.S. equities62 %64 %
Private investment funds18 %19 %
International equities13 %12 %
U.S. fixed income7 %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 
 March 31
(in thousands)20252024
Service cost$239 $287 
Interest cost1,197 1,128 
Net Periodic Cost$1,436 $1,415 
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 
 March 31
(in thousands)20252024
Interest cost$10 $14 
Recognized actuarial gain(379)(469)
Net Periodic Benefit$(369)$(455)