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Defined Severance Benefits
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Defined Severance Benefits Defined Severance Benefits
Defined 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 March 31,
(in thousands)
20222021
Current service costs$38,967 $30,555 
Interest expense1,704 594 
Amortization of:
Prior service credit906 23 
Net actuarial loss2,905 1,100 
Net periodic benefit costs charged to expense$44,482 $32,272