Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 17,156	$ 23,726	$ 58,431	$ 43,670
Other comprehensive income (loss):
Foreign currency translation adjustments	(2,712)	1,254	(2,945)	245
Unrealized gain on investments, net of tax	1,496	42	1,342	318
Other	(8)	(1)	(23)	0
Other comprehensive income (loss)	(1,224)	1,295	(1,626)	563
Comprehensive income	$ 15,932	$ 25,021	$ 56,805	$ 44,233