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Pension and Postretirement Plans (Tables)
 9 Months Ended
Sep. 30, 2021
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)2021202020212020
Service cost$5,775 $5,457 $17,254 $17,044 
Interest cost6,754 8,139 20,162 24,448 
Expected return on assets(34,800)(28,347)(103,078)(85,081)
Amortization of prior service cost711 708 2,134 2,123 
Recognized actuarial gain(1,671)— (6,234)— 
Net Periodic Benefit(23,231)(14,043)(69,762)(41,466)
Special separation benefit expense
— 7,783 1,118 13,797 
Total Benefit$(23,231)$(6,260)$(68,644)$(27,669)
Schedule of Allocation of Plan Assets The assets of the Company’s pension plans were allocated as follows:
  As of
  September 30,
2021		December 31,
2020
  
U.S. equities60 %58 %
Private investment fund18 %18 %
U.S. stock index fund9 %9 %
International equities9 %8 %
U.S. fixed income4 %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)2021202020212020
Service cost$256 $238 $767 $715 
Interest cost736 920 2,207 2,759 
Amortization of prior service cost83 83 248 248 
Recognized actuarial loss1,482 1,316 4,447 3,950 
Net Periodic Cost$2,557 $2,557 $7,669 $7,672 
Other Postretirement Benefit Plan, Defined Benefit [Member]  
Schedule of Net Benefit Costs
Other Postretirement Plans. The total cost 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)2021202020212020
Interest cost$23 $41 $69 $125 
Amortization of prior service credit(1)(120)(5)(361)
Recognized actuarial gain(877)(1,012)(2,632)(3,036)
Net Periodic Benefit$(855)$(1,091)$(2,568)$(3,272)