Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net income	$ 9,018	$ 2,499
Other comprehensive income (loss), net of tax:
Change in unrealized losses on securities, net of tax	(17)
Foreign currency translation adjustments	(596)	303
Total other comprehensive income (loss), net of tax	(608)	281
Comprehensive income	8,410	2,780
Auction Rate Securities [Member]
Other comprehensive income (loss), net of tax:
Change in unrealized losses on securities, net of tax	(17)	(15)
Available-for-sale Securities [Member]
Other comprehensive income (loss), net of tax:
Change in unrealized losses on securities, net of tax	$ 5	$ (7)