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Pension and Postretirement Plans (Tables)
 9 Months Ended
Sep. 30, 2022
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)2022202120222021
Service cost$5,557 $5,775 $16,581 $17,254 
Interest cost7,612 6,754 22,893 20,162 
Expected return on assets(41,779)(34,800)(125,705)(103,078)
Amortization of prior service cost708 711 2,126 2,134 
Recognized actuarial gain(17,538)(1,671)(52,306)(6,234)
Net Periodic Benefit(45,440)(23,231)(136,411)(69,762)
Special separation benefit expense
— — — 1,118 
Total Benefit$(45,440)$(23,231)$(136,411)$(68,644)
Schedule of Allocation of Plan Assets The assets of the Company’s pension plans were allocated as follows:
  As of
  September 30,
2022		December 31,
2021
  
U.S. equities61 %61 %
Private investment funds17 %17 %
U.S. stock index fund8 %9 %
International equities9 %9 %
U.S. fixed income5 %4 %
  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)2022202120222021
Service cost$227 $256 $683 $767 
Interest cost823 736 2,467 2,207 
Amortization of prior service cost9 83 27 248 
Recognized actuarial loss166 1,482 499 4,447 
Net Periodic Cost$1,225 $2,557 $3,676 $7,669 
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)2022202120222021
Interest cost$24 $23 $73 $69 
Amortization of prior service credit(1)(1)(5)(5)
Recognized actuarial gain(711)(877)(2,132)(2,632)
Net Periodic Benefit$(688)$(855)$(2,064)$(2,568)