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Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 11,487	$ 5,598
Other comprehensive income (loss):
Foreign currency translation adjustments	(638)	3,047
Unrealized gain (loss) on investments, net of tax	(8)	646
Other	1	(2)
Comprehensive income	10,842	9,289
Foreign currency translation adjustments	(9,319)		(8,681)
Unrealized loss on investments, net of tax	(1,859)		(1,851)
Other	(3)		(4)
Accumulated other comprehensive loss	$ (11,181)		$ (10,536)

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