Defined Severance Benefits (Tables)

3 Months Ended

Mar. 31, 2022

Retirement Benefits [Abstract]

Schedule of components of net periodic benefit costs

The following table provides the components of net periodic benefit costs and the portion of these costs charged to expense:

	Three Months Ended March 31,
(in thousands)	2022		2021
Current service costs	$	38,967	$	30,555
Interest expense	1,704		594
Amortization of:
Prior service credit	906		23
Net actuarial loss	2,905		1,100
Net periodic benefit costs charged to expense	$	44,482	$	32,272