Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 22,150	$ 8,457	$ 41,275	$ 19,944
Other comprehensive income (loss):
Foreign currency translation adjustments	(206)	(371)	(233)	(1,009)
Unrealized gain (loss) on investments, net of tax	(145)	284	(154)	276
Other	(7)	0	(15)	1
Other comprehensive loss	(358)	(87)	(402)	(732)
Comprehensive income	$ 21,792	$ 8,370	$ 40,873	$ 19,212