Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 216,355	$ 122,327	$ 106,712
Other comprehensive income (loss), net of tax:
Amortization of loss on cash flow hedge	862	862	862
Foreign currency translation adjustment	(1,609)	2,961	(606)
Other comprehensive income (loss), net of tax	(747)	3,823	256
Comprehensive income	$ 215,608	$ 126,150	$ 106,968