Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
COMPREHENSIVE INCOME (LOSS):
Net income	$ 598,626	$ 306,276	$ 454,433
Foreign currency translation adjustments, net of tax	(18,702)	18,973	(1,553)
Foreign defined benefit plans, net of tax	812	(3,719)	(2,324)
Total other comprehensive income (loss)	(17,890)	15,254	(3,877)
Total comprehensive income (loss)	$ 580,736	$ 321,530	$ 450,556