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Pension Plans and Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost Components of net periodic benefit cost included in net income were as follows:
 Pension BenefitsOther Benefits
Three Months Ended
June 30,
Six Months Ended
June 30,
Three Months Ended
June 30,
Six Months Ended
June 30,
 20252024202520242025202420252024
 (In thousands)
Service cost$2,897 $1,768 $4,580 $3,765 $384 $96 $469 $193 
Interest cost13,782 11,133 25,235 22,763 869 503 1,401 1,008 
Expected return on plan assets
(16,987)(14,654)(30,991)(30,153)(487)(487)(973)(974)
Amortization of prior service cost 792 820 1,583 1,640 22 12 44 23 
Net periodic benefit (income) / loss$484 $(933)$407 $(1,985)$788 $124 $941 $250