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Pension and Postretirement Plans (Tables)
 3 Months Ended
Mar. 31, 2024
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)20242023
Service cost$14,034 $9,243 
Interest cost11,194 11,534 
Expected return on assets(41,690)(38,338)
Amortization of prior service (credit) cost(494)410 
Recognized actuarial gain(12,518)(10,140)
Net Periodic Benefit(29,474)(27,291)
Special separation benefit expense
418 4,129 
Total Benefit$(29,056)$(23,162)
Schedule of Allocation of Plan Assets The assets of the Company’s pension plans were allocated as follows:
  As of
  March 31,
2024		December 31,
2023
  
U.S. equities54 %59 %
Private investment funds16 %17 %
International equities12 %14 %
U.S. fixed income18 %7 %
U.S. stock index fund— %3 %
  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)20242023
Service cost$287 $148 
Interest cost1,128 1,165 
Net Periodic Cost$1,415 $1,313 
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)20242023
Interest cost$14 $22 
Amortization of prior service credit— (1)
Recognized actuarial gain(469)(626)
Net Periodic Benefit$(455)$(605)