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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Schedule Of Net Periodic Benefit Costs
The following table presents the net periodic benefit cost of the Pension Plans combined:
 Three Months EndedNine Months Ended
 September 30,September 30,
 2024202320242023
 (In Thousands)
Components of net periodic benefit cost:
    
Service cost$1,253 $1,297 $3,759 $3,892 
Interest cost6,739 7,455 20,217 22,365 
Expected return on plan assets(7,443)(8,277)(22,329)(24,830)
Amortization of prior service cost475 543 1,425 1,629 
Amortization of actuarial loss1,207 1,536 3,621 4,608 
Net periodic benefit cost
$2,231 $2,554 $6,693 $7,664