Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Statement of Income and Comprehensive Income [Abstract]
Net income (loss)	$ (3,367)	$ 19,104
Other comprehensive income:
Unrealized gain (loss) on investments, net of tax	42	(22)
Unrealized gain (loss) on currency translation	(3)	(1)
Other comprehensive income (loss)	39	(23)
Comprehensive income (loss)	$ (3,406)	$ 19,081