Defined Severance Benefits (Tables)

6 Months Ended

Jun. 30, 2021

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 June 30,				Six Months Ended June 30,
(in thousands)	2021		2020		2021		2020
Current service costs	$	32,224	$	14,758	$	62,779	$	29,179
Interest expense	591		316		1,185		640
Amortization of:
Prior service credit	23		—		46		—
Net actuarial loss	918		36		2,018		73
Net periodic benefit costs charged to expense	$	33,756	$	15,110	$	66,028	$	29,892