Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 127,195	$ 56,991	$ 317,940	$ 184,986
Other comprehensive income (loss):
Foreign currency translation adjustments, before reclassification and tax:	7,521	(5,816)	2,785	(1,580)
Less: reclassification adjustment for (losses) in net income upon liquidation	0	0	(4,039)	0
Foreign currency translation adjustment, before tax	7,521	(5,816)	6,824	(1,580)
Income tax (expense)	(48)	(85)	(29)	(57)
Foreign currency translation adjustments, net of tax	7,473	(5,901)	6,795	(1,637)
Changes in employee benefit related items:
Amortization of prior service cost	3	5	8	10
Recognized actuarial gain	111	254	320	508
Changes in employee benefit related items	114	259	328	518
Income tax benefit (expense)	1	(1)	(2)	(3)
Employee benefit related items, net of tax	115	258	326	515
Other comprehensive income (loss)	7,588	(5,643)	7,121	(1,122)
Comprehensive income	$ 134,783	$ 51,348	$ 325,061	$ 183,864