CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income (loss)	$ 41,029	$ (100,060)	$ (33,472)
Unrealized hedging gains, net of provision for (benefit from) income taxes of $161, $(161) and $—		(298)	298
Net change in unrealized gains on marketable securities, net of benefit from income taxes of $6,543, $8,487 and $2,380	(4,418)	(15,760)	(12,152)
Other comprehensive loss	(4,418)	(16,058)	(11,854)
Comprehensive income (loss)	$ 36,611	$ (116,118)	$ (45,326)