Defined Severance Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Retirement Benefits [Abstract]
Current service costs	$ 33,304	$ 37,689	$ 67,752	$ 76,656
Interest cost	3,286	1,627	6,673	3,331
Amortization of:
Prior service credit	816	866	1,656	1,772
Net actuarial loss	5	2,772	21	5,677
Net periodic benefit cost	$ 37,411	$ 42,954	$ 76,102	$ 87,436