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Pension and Postretirement Plans (Tables)
 6 Months Ended
Jun. 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 
 June 30		Six Months Ended 
 June 30
(in thousands)2022202120222021
Service cost$4,993 $5,877 $11,024 $11,479 
Interest cost7,611 6,754 15,281 13,408 
Expected return on assets(41,963)(33,702)(83,926)(68,278)
Amortization of prior service cost709 712 1,418 1,423 
Recognized actuarial gain(17,539)(1,671)(34,768)(4,563)
Net Periodic Benefit(46,189)(22,030)(90,971)(46,531)
Special separation benefit expense
— 1,118 — 1,118 
Total Benefit$(46,189)$(20,912)$(90,971)$(45,413)
Schedule of Allocation of Plan Assets The assets of the Company’s pension plans were allocated as follows:
  As of
  June 30,
2022		December 31,
2021
  
U.S. equities63 %61 %
Private investment funds16 %17 %
U.S. stock index fund8 %9 %
International equities8 %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 
 June 30		Six Months Ended 
 June 30
(in thousands)2022202120222021
Service cost$228 $256 $456 $511 
Interest cost822 735 1,644 1,471 
Amortization of prior service cost9 82 18 165 
Recognized actuarial loss167 1,483 333 2,965 
Net Periodic Cost$1,226 $2,556 $2,451 $5,112 
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)2022202120222021
Interest cost$25 $10 $49 $46 
Amortization of prior service credit(2)(2)(4)(4)
Recognized actuarial gain(710)(736)(1,421)(1,755)
Net Periodic Benefit$(687)$(728)$(1,376)$(1,713)