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Pension and Severance Plans (Korean Severance Plan) (Details) - Korean Severance Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deferred Compensation Liability, Current and Noncurrent [Roll Forward]
Balance at beginning of the year	$ 56,289	$ 73,345
Provision of severance benefits	1,653	2,119
Severance payments	(8,770)	(15,295)
Foreign currency (gain) loss	(1,266)	(3,880)
Balance at the end of year	47,906	56,289
Payments remaining with the National Pension Fund	(119)	(124)
Total accrued severance plan obligations at December 31	47,787	56,165
Less current portion of accrued severance plan obligations (Note 10)	7,906	7,422
Non-current portion of accrued severance plan obligations	$ 39,881	$ 48,743

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- Definition

Deferred Compensation Liability, Current and Noncurrent [Roll Forward]

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Lump-sum payments related to termination of employment (employees and directors), based on length of service, seniority and average monthly wages at the time of termination, which is not related to restructurings, pension plans or other post retirement benefit plans. Severance benefits are estimated assuming all eligible employees were to terminate their employment at the balance sheet date.

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Payments remaining with the Korean National Pension Fund.

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Provision related to lump-sum payment upon termination of employment (employees and directors), based on length of service, seniority and average monthly wages at the time of termination, which is not related to restructurings, pension plans or other post retirement benefit plans. Severance benefits are estimated assuming all eligible employees were to terminate their employment at the balance sheet date.

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Foreign currency translation adjustments related to the transactions for lump-sum payment upon termination of employment (employees and directors), based on length of service, seniority and average monthly wages at the time of termination, which is not related to restructurings, pension plans or other post retirement benefit plans. Severance benefits are estimated assuming all eligible employees were to terminate their employment at the balance sheet date.

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Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

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For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement that is payable within one year of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 712
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481179/712-10-25-4

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-URI https://asc.fasb.org//1943274/2147481179/712-10-25-5

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-Publisher FASB
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The carrying amount as of the balance sheet date of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 712
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481179/712-10-25-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481179/712-10-25-5

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 712
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481179/712-10-25-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 712
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481179/712-10-25-5

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