Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 27,858	$ (24,096)	$ 15,516	$ (69,867)
Other comprehensive income (loss):
Unrealized net gain (loss) on marketable securities	(36)	154	(35)	(24)
Other comprehensive income (loss)	(36)	154	(35)	(24)
Comprehensive income (loss)	$ 27,822	$ (23,942)	$ 15,481	$ (69,891)