CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 85,169	$ 52,231
Other comprehensive income, net of tax
Foreign currency translation adjustment	380	951
Total other comprehensive income	380	951
Total comprehensive income	$ 85,549	$ 53,182