Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 19,125	$ 11,487
Other comprehensive income (loss):
Foreign currency translation adjustments	(27)	(638)
Unrealized gain on investments, net of tax	(9)	(8)
Other	(8)	1
Other comprehensive loss	(44)	(645)
Comprehensive income	$ 19,081	$ 10,842