CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net loss	$ (24,570)	$ (37,639)	$ (36,368)	$ (62,841)
Unrealized gains (losses) on securities, net of tax	2,207	(122)	17,876	1,616
Reclassification adjustment for realized gain included in net loss	(172)		(1,335)
Comprehensive loss	$ (22,535)	$ (37,761)	$ (19,827)	$ (61,225)