CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 37,055	$ 37,704	$ 94,220	$ 95,355
Comprehensive income, net of tax	$ 37,055	$ 37,704	$ 94,220	$ 95,355