Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 67,057	$ 43,686	$ 157,362	$ 105,925
Other comprehensive income:
Translation adjustment	6,238	5,797	3,170	5,825
Unamortized pension adjustments	(28)	362	(88)	462
Comprehensive net income	$ 73,323	$ 49,121	$ 160,620	$ 111,288