Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
COMPREHENSIVE INCOME (LOSS):
Net income	$ 454,433	$ 434,288	$ 290,584
Foreign currency translation adjustments, net of tax	(1,553)	(19,616)	24,009
Foreign defined benefit plans, net of tax	(2,324)	0	0
Total other comprehensive income (loss)	(3,877)	(19,616)	24,009
Total comprehensive income (loss)	$ 450,556	$ 414,672	$ 314,593