Pension and Severance Plans (Korean Severance Plan) (Details) - Korean Severance Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Deferred Compensation Liability, Current and Noncurrent [Roll Forward]
Balance at beginning of the year	$ 73,345	$ 98,162
Provision of severance benefits	2,119	6,144
Severance payments	(15,295)	(22,775)
Foreign currency (gain) loss	(3,880)	(8,186)
Balance at the end of year	56,289	73,345
Payments remaining with the National Pension Fund	(124)	(138)
Total accrued severance plan obligations at December 31	56,165	73,207
Less current portion of accrued severance plan obligations	7,422	8,194
Non-current portion of accrued severance plan obligations	$ 48,743	$ 65,013