Bank Credit Agreements and Other Short-Term and Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total long-term debt	$ 312,247	$ 98,641
Less: Current portion of long-term debt	(21,860)	(33,105)
Less: Unamortized debt-issuance costs	(2,208)	(1,135)
Long-term debt, net of current portion	288,179	64,401
Various during 2021
Debt Instrument [Line Items]
Short-term debt	$ 140,567	13,342
Short-term debt, Interest Rate	Libor plus margin
Notes Payable to Bank \| Bank of Taiwan \| June 2033
Debt Instrument [Line Items]
Total long-term debt	$ 4,154	4,242
Long-term debt, Interest Rate	Variable, 1.3% base
Notes Payable to Bank \| China Trust Bank \| December 2021
Debt Instrument [Line Items]
Total long-term debt	$ 3,511
Long-term debt, Interest Rate	Taibor 3 month rate + 0.5%
Notes Payable to Bank \| China Trust Bank \| May 2024
Debt Instrument [Line Items]
Total long-term debt	$ 16,714	19,212
Long-term debt, Interest Rate	Taibor 3 month rate + 0.5%
Notes Payable to Bank \| E Sun Bank \| December 2022
Debt Instrument [Line Items]
Total long-term debt	$ 3,511
Long-term debt, Interest Rate	1-M deposit rate plus 0.08%
Notes Payable to Bank \| E Sun Bank \| June 2027
Debt Instrument [Line Items]
Total long-term debt	$ 386
Long-term debt, Interest Rate	1-M deposit rate plus 0.08%
Notes Payable to Bank \| E Sun Bank \| June 2030
Debt Instrument [Line Items]
Total long-term debt	$ 1,721
Long-term debt, Interest Rate	1-M deposit rate plus 0.08%
Term Loan and Revolver \| May 2023
Debt Instrument [Line Items]
Total long-term debt	$ 282,250	$ 75,187
Long-term debt, Interest Rate	Libor plus margin

Long-term debt, interest rate.

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Amount, before accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the operating cycle if longer, excluding current portion.

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