Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
COMPREHENSIVE INCOME (LOSS):
Net income	$ 170,871	$ 75,749	$ 430,682	$ 211,860
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	(10,046)	11,156	(14,485)	3,990
Foreign defined benefit plans, net of tax	38	0	117	0
Total other comprehensive income (loss)	(10,008)	11,156	(14,368)	3,990
Total comprehensive income (loss)	$ 160,863	$ 86,905	$ 416,314	$ 215,850