Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements of Comprehensive Income (Loss)
Net (loss) income	$ (92,273)	$ (46,284)	$ 53,815
Other comprehensive (loss) income:
Unrealized net (loss) gain on marketable securities	57	(58)	1
Other comprehensive (loss) income	57	(58)	1
Comprehensive (loss) income	$ (92,216)	$ (46,342)	$ 53,816