Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Statement of Income and Comprehensive Income [Abstract]
Net income (loss)	$ 140,659		$ 125,608	$ (11,077)
Other comprehensive income:
Unrealized losses on available for sale securities, net	(11)	[1]
Cumulative translation adjustment, net	(3,145)		(1,172)	1,569
Comprehensive income (loss)	$ 137,503		$ 124,436	$ (9,508)

[1] Net of taxes