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Pension Plans and Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
 Pension BenefitsOther Benefits
Three Months Ended
June 30,
Six Months Ended
June 30,
Three Months Ended
June 30,
Six Months Ended
June 30,
 20232022202320222023202220232022
 (In thousands)
Service cost$1,879 $2,988 $3,758 $5,905 $84 $166 $169 $331 
Interest cost11,949 7,858 23,859 15,679 534 347 1,069 694 
Expected return on plan assets
(15,109)(20,888)(30,219)(41,756)(635)(737)(1,269)(1,475)
Amortization of prior service cost 820 807 1,640 1,614 10 20 13 
Net periodic benefit income$(461)$(9,235)$(962)$(18,558)$(7)$(218)$(11)$(437)