Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 244,725	$ 276,452	$ (42,613)
Other comprehensive income (loss):
Change in unrealized loss on available-for-sale securities, net	(10)		(33)
Amounts reclassified into earnings related to investments	10
Other comprehensive income (loss), net			(33)
Comprehensive income (loss)	$ 244,725	$ 276,452	$ (42,646)