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Defined Severance Benefits
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Defined Severance Benefits Defined Severance Benefits
Defined severance benefits are for employees of the Company’s Korean subsidiaries. The Korean subsidiaries offer defined benefits to provide severance payments to all employees that leave the Company based on employment length and pay rate.
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)
2021202020212020
Current service costs$32,224 $14,758 $62,779 $29,179 
Interest expense591 316 1,185 640 
Amortization of:
Prior service credit23 — 46 — 
Net actuarial loss918 36 2,018 73 
Net periodic benefit costs charged to expense$33,756 $15,110 $66,028 $29,892