Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 70,248	$ 113,523	$ 144,282	$ 190,745
Other comprehensive income (loss):
Foreign currency translation adjustment, before reclassification and tax	9,867	(538)	13,868	(4,736)
Less: reclassification adjustment for (losses) included in net income upon liquidation	0	(4,039)	0	(4,039)
Foreign currency translation adjustments, before tax	9,867	3,501	13,868	(697)
Income tax (expense) benefit	(88)	(14)	(70)	19
Foreign currency translation adjustments, net of tax	9,779	3,487	13,798	(678)
Changes in employee benefit related items:
Amortization of prior service cost	0	4	229	5
Recognized actuarial gain	0	203	0	209
Less: reclassification adjustment for (losses) included in net income upon retirement plan liquidation	0	0	(8,578)	0
Changes in employee benefit related items	0	207	8,807	214
Income tax (expense)	0	(2)	(55)	(3)
Employee benefit related items, net of tax	0	205	8,752	211
Other comprehensive income (loss)	9,779	3,692	22,550	(467)
Comprehensive income	$ 80,027	$ 117,215	$ 166,832	$ 190,278