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Defined Severance Benefits
 6 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Defined Severance Benefits Defined Severance Benefits
The following table provides the components of net periodic benefit costs and the portion of these costs charged to expense:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)
2023202220232022
Current service costs$33,304 $37,689 $67,752 $76,656 
Interest cost3,286 1,627 6,673 3,331 
Amortization of:
Prior service credit816 866 1,656 1,772 
Net actuarial loss5 2,772 21 5,677 
Net periodic benefit cost$37,411 $42,954 $76,102 $87,436