Condensed Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net loss	$ (28,723)	$ (108,971)
Other comprehensive income (loss), net of tax :
Unrealized gain (loss) on marketable securities, net of tax	35	(54)
Add: reclassification adjustment for net gains (losses) included in net income, net of tax
Other comprehensive income (loss)	35	(54)
Comprehensive loss	$ (28,688)	$ (109,025)