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Defined Severance Benefits
 6 Months Ended
Jun. 30, 2022
Retirement Benefits [Abstract]  
Defined Severance Benefits Defined Severance BenefitsDefined severance benefits are for employees of the Company’s Korean subsidiaries. Pursuant to the Employee Retirement Benefit Security Act of Korea, eligible employees of the Korean subsidiaries receive defined benefits as severance payments upon leaving 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)
2022202120222021
Current service costs$37,689 $32,224 $76,656 $62,779 
Interest expense1,627 591 3,331 1,185 
Amortization of:
Prior service credit866 23 1,772 46 
Net actuarial loss2,772 918 5,677 2,018 
Net periodic benefit costs charged to expense$42,954 $33,756 $87,436 $66,028