Defined Severance Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Retirement Benefits [Abstract]
Current service costs	$ 37,689	$ 32,224	$ 76,656	$ 62,779
Interest expense	1,627	591	3,331	1,185
Amortization of:
Prior service credit	866	23	1,772	46
Net actuarial loss	2,772	918	5,677	2,018
Net periodic benefit costs charged to expense	$ 42,954	$ 33,756	$ 87,436	$ 66,028