Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
COMPREHENSIVE INCOME (LOSS):
Net income	$ 110,598	$ 89,915
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	(8,837)	(13,700)
Foreign defined benefit plans, net of tax	40	0
Total other comprehensive income (loss)	(8,797)	(13,700)
Total comprehensive income (loss)	$ 101,801	$ 76,215