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Pension and Postretirement Plans (Tables)
 9 Months Ended
Sep. 30, 2023
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)2023202220232022
Service cost$8,490 $5,557 $25,306 $16,581 
Interest cost11,559 7,612 34,652 22,893 
Expected return on assets(38,351)(41,779)(114,774)(125,705)
Amortization of prior service cost412 708 1,234 2,126 
Recognized actuarial gain(9,888)(17,538)(29,916)(52,306)
Net Periodic Benefit(27,778)(45,440)(83,498)(136,411)
Special separation benefit expense
— — 9,646 — 
Total Benefit$(27,778)$(45,440)$(73,852)$(136,411)
Schedule of Allocation of Plan Assets The assets of the Company’s pension plans were allocated as follows:
  As of
  September 30,
2023		December 31,
2022
  
U.S. equities61 %59 %
Private investment funds17 %16 %
International equities12 %11 %
U.S. fixed income6 %7 %
U.S. stock index fund4 %7 %
  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)2023202220232022
Service cost$148 $227 $444 $683 
Interest cost1,164 823 3,494 2,467 
Amortization of prior service cost— 9 — 27 
Recognized actuarial loss— 166 — 499 
Net Periodic Cost$1,312 $1,225 $3,938 $3,676 
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)2023202220232022
Interest cost$38 $24 $112 $73 
Amortization of prior service credit(2)(1)(4)(5)
Recognized actuarial gain(585)(711)(1,757)(2,132)
Net Periodic Benefit$(549)$(688)$(1,649)$(2,064)