Condensed Consolidated Statements of Comprehensive Loss (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Net (loss) income	$ (12,682)		$ 14,325		$ (233,354)		$ (274,166)
Foreign currency translation adjustments:
Unrealized foreign currency translation adjustment, net of tax	0		1		0		(7)
Less: Reclassification adjustment for net gains (losses) included in net income (loss), net of tax	0		0		0		0
Net foreign currency translation adjustment, net of tax	0		1		0		(7)
Unrealized gains (losses) on investments:
Unrealized holding gains (losses) arising during the period, net of tax	4,978		(1,618)		13,924		14,177
Less: Reclassification adjustment for net gains (losses) included in net (loss) income, net of tax	304	[1]	(1,189)	[1]	879	[1]	7,680	[1]
Net unrealized gains (losses) on investments, net of tax	4,674		(429)		13,045		6,497
Other comprehensive income (loss)	4,674		(428)		13,045		6,490
Comprehensive (loss) income	$ (8,008)		$ 13,897		$ (220,309)		$ (267,676)

[1] Included in net (losses) gains on investments on our condensed consolidated statements of operations.