Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income	$ 294,969	$ 254,860	$ 240,755
Other comprehensive loss, net of tax
Foreign currency translation adjustments	(120)	(3,692)	(10,183)
Pension liability adjustments, net	(49)	69	59
Other comprehensive loss	(169)	(3,623)	(10,124)
Comprehensive income	$ 294,800	$ 251,237	$ 230,631