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Pension and Postretirement Plans (Tables)
 9 Months Ended
Sep. 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 
 September 30		Nine Months Ended 
 September 30
(in thousands)2024202320242023
Service cost$14,761 $8,490 $42,866 $25,306 
Interest cost11,220 11,559 33,660 34,652 
Expected return on assets(41,487)(38,351)(124,416)(114,774)
Amortization of prior service (credit) cost(487)412 (1,463)1,234 
Recognized actuarial gain(11,891)(9,888)(35,672)(29,916)
Net Periodic Benefit(27,884)(27,778)(85,025)(83,498)
Early retirement program and special separation benefit expense
3,665 — 20,493 9,646 
Total Benefit$(24,219)$(27,778)$(64,532)$(73,852)
Schedule of Allocation of Plan Assets The assets of the Company’s pension plans were allocated as follows:
  As of
  September 30,
2024		December 31,
2023
  
U.S. equities56 %59 %
U.S. fixed income17 %7 %
Private investment funds16 %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 
 September 30		Nine Months Ended 
 September 30
(in thousands)2024202320242023
Service cost$287 $148 $862 $444 
Interest cost1,128 1,164 3,385 3,494 
Net Periodic Cost$1,415 $1,312 $4,247 $3,938 
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)2024202320242023
Interest cost$14 $38 $42 $112 
Amortization of prior service credit— (2)— (4)
Recognized actuarial gain(469)(585)(1,408)(1,757)
Net Periodic Benefit$(455)$(549)$(1,366)$(1,649)