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Defined Severance Benefits | 9 Months Ended
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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) | 2022 |  | 2021 |  | 2022 |  | 2021
Current service costs | $ | 33,066 |  |  | $ | 32,502 |  |  | $ | 109,722 |  |  | $ | 95,281 |
Interest expense | 2,446 |  |  | 854 |  |  | 5,777 |  |  | 2,039 |
Amortization of: |  |  |  |  |  |  |
Prior service credit | 810 |  |  | 23 |  |  | 2,582 |  |  | 69 |
Net actuarial loss | 298 |  |  | 1,242 |  |  | 5,975 |  |  | 3,260 |
Net periodic benefit costs charged to expense | $ | 36,620 |  |  | $ | 34,621 |  |  | $ | 124,056 |  |  | $ | 100,649 |

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- Definition The entire disclosure for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 715 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6472162&loc=d3e58407-109430 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -URI https://asc.fasb.org/subtopic&trid=2235042 + Details
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