Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 21,742	$ 20,565	$ 45,479	$ 55,980
Other comprehensive income (loss):
Foreign currency translation adjustments	299	378	815	(2,386)
Unrealized gain (loss) on investments, net of tax	1	10	17	(23)
Unrealized gain (loss) on derivative, net of tax	765	0	(2,134)	0
Other	(1)	(3)	(1)	(10)
Other comprehensive income (loss)	1,064	385	(1,303)	(2,419)
Comprehensive income	$ 22,806	$ 20,950	$ 44,176	$ 53,561