Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 56,316	$ 88,676	$ 210,385	$ 260,680
Other comprehensive (loss):
Foreign currency translation adjustments, before tax	(11,574)	(3,379)	(27,875)	(5,302)
Income tax benefit	284	99	544	90
Foreign currency translation adjustments, net of tax	(11,290)	(3,280)	(27,331)	(5,212)
Changes in employee benefit related items:
Amortization of prior service cost	(4)	4	4	6
Recognized actuarial (loss) gain	(204)	264	237	202
Changes in employee benefit related items	(208)	268	241	208
Income tax benefit (expense)	3	(2)	(4)	(1)
Employee (expense) benefit related items, net of tax	(205)	266	237	207
Other comprehensive (loss)	(11,495)	(3,014)	(27,094)	(5,005)
Comprehensive income	$ 44,821	$ 85,662	$ 183,291	$ 255,675