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Defined Severance Benefits
 9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
(in thousands)
2022202120222021
Current service costs$33,066 $32,502 $109,722 $95,281 
Interest expense2,446 854 5,777 2,039 
Amortization of:
Prior service credit810 23 2,582 69 
Net actuarial loss298 1,242 5,975 3,260 
Net periodic benefit costs charged to expense$36,620 $34,621 $124,056 $100,649