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Pension and Postretirement Plans (Tables)
 6 Months Ended
Jun. 30, 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 
 June 30		Six Months Ended 
 June 30
(in thousands)2024202320242023
Service cost$14,071 $7,573 $28,105 $16,816 
Interest cost11,246 11,559 22,440 23,093 
Expected return on assets(41,239)(38,085)(82,929)(76,423)
Amortization of prior service (credit) cost(482)412 (976)822 
Recognized actuarial gain(11,263)(9,888)(23,781)(20,028)
Net Periodic Benefit(27,667)(28,429)(57,141)(55,720)
Early retirement program and special separation benefit expense
16,410 5,517 16,828 9,646 
Total Benefit$(11,257)$(22,912)$(40,313)$(46,074)
Schedule of Allocation of Plan Assets The assets of the Company’s pension plans were allocated as follows:
  As of
  June 30,
2024		December 31,
2023
  
U.S. equities56 %59 %
U.S. fixed income18 %7 %
Private investment funds15 %17 %
International equities11 %14 %
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 
 June 30		Six Months Ended 
 June 30
(in thousands)2024202320242023
Service cost$288 $148 $575 $296 
Interest cost1,129 1,165 2,257 2,330 
Net Periodic Cost$1,417 $1,313 $2,832 $2,626 
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 
 June 30		Six Months Ended 
 June 30
(in thousands)2024202320242023
Interest cost$14 $52 $28 $74 
Amortization of prior service credit— (1)— (2)
Recognized actuarial gain(470)(546)(939)(1,172)
Net Periodic Benefit$(456)$(495)$(911)$(1,100)