Defined Severance Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Retirement Benefits [Abstract]
Current service costs	$ 34,448	$ 38,967
Interest cost	3,387	1,704
Amortization of:
Prior service credit	840	906
Net actuarial loss	16	2,905
Net periodic benefit cost	$ 38,691	$ 44,482