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Defined Severance Benefits
 9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
(in thousands)
2023202220232022
Current service costs$36,183 $33,066 $103,935 $109,722 
Interest cost3,749 2,446 10,422 5,777 
Amortization of:
Prior service credit817 810 2,473 2,582 
Net actuarial loss392 298 413 5,975 
Net periodic benefit cost$41,141 $36,620 $117,243 $124,056